The chemical symbol for Rubidium is Rb. Major advantage of lead shield is in its compactness due to its higher density. Technetium is the lightest element whose isotopes are all radioactive; none are stable. Mendelevium is a metallic radioactive transuranic element in the actinide series, it is the first element that currently cannot be produced in macroscopic quantities. If you want to get in touch with us, please do not hesitate to contact us via e-mail: Discoverer: Ramsey, Sir William and Cleve, Per Teodor. . Plutonium is an actinide metal of silvery-gray appearance that tarnishes when exposed to air, and forms a dull coating when oxidized. Radon is a chemical element with atomic number 86 which means there are 86 protons and 86 electrons in the atomic structure. . Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure. The chemical symbol for Gadolinium is Gd. The chemical symbol for Krypton is Kr. The chemical symbol for Thulium is Tm. Atomic mass is given in the table, as well as the atomic number and atomic mass number. On the periodic table of the elements, atomic radius tends to increase when moving down columns, but decrease when moving across rows (left to right). Promethium is a chemical element with atomic number 61 which means there are 61 protons and 61 electrons in the atomic structure. Molybdenum a silvery metal with a gray cast, has the sixth-highest melting point of any element. Calcium is an alkaline earth metal, it is a reactive pale yellow metal that forms a dark oxide-nitride layer when exposed to air. Density is defined as the mass per unit volume. Cerium is the second element in the lanthanide series. Nobelium is a chemical element with atomic number 102 which means there are 102 protons and 102 electrons in the atomic structure. Iridium is a very hard, brittle, silvery-white transition metal of the platinum group, iridium is generally credited with being the second densest element (after osmium). Mass number. In nuclear reactors, promethium equilibrium exists in power operation. Subtracting the number of protons (7) from the element's mass number (14) makes it possible to determine the number of neutrons in the atom. The mass of an atom relative to that of carbon-12. Chlorine is a yellow-green gas at room temperature. Einsteinium is the seventh transuranic element, and an actinide. Indium is a chemical element with atomic number 49 which means there are 49 protons and 49 electrons in the atomic structure. Hydrogen atomic number = 1 Helium atomic number = 2. The Ion P3− Has _____ Protons And _____ Electrons. Platinum is a dense, malleable, ductile, highly unreactive, precious, silverish-white transition metal. Krypton is a member of group 18 (noble gases) elements. Thulium is a chemical element with atomic number 69 which means there are 69 protons and 69 electrons in the atomic structure. Mercury is a chemical element with atomic number 80 which means there are 80 protons and 80 electrons in the atomic structure. The most commonly used spontaneous fission neutron source is the radioactive isotope californium-252. The chemical symbol for Niobium is Nb. Antimony is a chemical element with atomic number 51 which means there are 51 protons and 51 electrons in the atomic structure. The chemical symbol for Tin is Sn. The chemical symbol for Nitrogen is N . Discoverer: Davy, Sir H. and Thénard, L.-J. Anything with seven protons within its nucleus (and only seven) is an atom of nitrogen. A freshly exposed surface of pure copper has a reddish-orange color. False. We assume no responsibility for consequences which may arise from the use of information from this website. The chemical symbol for Scandium is Sc. Arsenic is a chemical element with atomic number 33 which means there are 33 protons and 33 electrons in the atomic structure. Some nitrogen atoms have 15 nucleons in the nucleus and therefore have an atomic mass number of 15. Your email address will not be published. Tellurium is a chemical element with atomic number 52 which means there are 52 protons and 52 electrons in the atomic structure. Assuming spherical shape, the uranium atom have volume of about  26.9 ×10−30 m3. Its abundance in rocky planets like Earth is due to its abundant production by fusion in high-mass stars. Neodymium is not found naturally in metallic form or unmixed with other lanthanides, and it is usually refined for general use. The chemical symbol for Ruthenium is Ru. The chemical symbol for Bismuth is Bi. The chemical symbol for Phosphorus is P. As an element, phosphorus exists in two major forms—white phosphorus and red phosphorus—but because it is highly reactive, phosphorus is never found as a free element on Earth. Which of the following is a correct statement concerning nitrogen? A radioactive isotopeof nitrogen has 8 neutrons. Chlorine is a chemical element with atomic number 17 which means there are 17 protons and 17 electrons in the atomic structure. Lead is widely used as a gamma shield. The chemical symbol for Oxygen is O. Therefore, an element in a neutral state will have the same number of protons and electrons. 113Cd has specific absorption cross-section. Iron is a chemical element with atomic number 26 which means there are 26 protons and 26 electrons in the atomic structure. Scandium is a silvery-white metallic d-block element, it has historically been sometimes classified as a rare-earth element, together with yttrium and the lanthanides. Sulfur is a chemical element with atomic number 16 which means there are 16 protons and 16 electrons in the atomic structure. Since the density (ρ) of a substance is the total mass (m) of that substance divided by the total volume (V) occupied by that substance, it is obvious, the density of a substance strongly depends on its atomic mass and also on the atomic number density (N; atoms/cm3). Polonium is a rare and highly radioactive metal with no stable isotopes, polonium is chemically similar to selenium and tellurium, though its metallic character resembles that of its horizontal neighbors in the periodic table: thallium, lead, and bismuth. It has remarkable resistance to corrosion, even at high temperatures, and is therefore considered a noble metal. Lutetium is the last element in the lanthanide series, and it is traditionally counted among the rare earths. What is Radius and Density of Atomic Nucleus - Definition, What is Uranium in the Environment - Definition, What is Atomic and Nuclear Physics - Definition, What is Atomic and Nuclear Structure - Definition. As the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine. Thorium is moderately hard, malleable, and has a high melting point. It is a noble metal and a member of the platinum group. Its atomic number is 7 and it is denoted by the symbol ‘N’ in the periodic table. Nitrogen is the seventh element on the periodic table. Neon is a chemical element with atomic number 10 which means there are 10 protons and 10 electrons in the atomic structure. Discoverer: Corson, Dale R. and Mackenzie, K. R. The actinide or actinoid series encompasses the 15 metallic chemical elements with atomic numbers from 89 to 103, actinium through lawrencium. Technetium is a chemical element with atomic number 43 which means there are 43 protons and 43 electrons in the atomic structure. Sodium is a chemical element with atomic number 11 which means there are 11 protons and 11 electrons in the atomic structure. Nitrogen-14 is one of the very few stable nuclides with both an odd number of protons and of neutrons (seven each) and is the only one to make up a … Radon occurs naturally as an intermediate step in the normal radioactive decay chains through which thorium and uranium slowly decay into lead. The chemical symbol for Vanadium is V. Vanadium is a hard, silvery grey, ductile, and malleable transition metal. Pure radium is silvery-white alkaline earth metal. Nickel is a silvery-white lustrous metal with a slight golden tinge. Calcium is a chemical element with atomic number 20 which means there are 20 protons and 20 electrons in the atomic structure. Its density is about 70% higher than that of lead, and slightly lower than that of gold or tungsten. Explanation:Atomic number represents the total number of protons present in an atom. Elemental rubidium is highly reactive, with properties similar to those of other alkali metals, including rapid oxidation in air. The chemical symbol for Fermium is Fm. The mass number (15) is the sum of the protons and neutrons. Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. Yttrium is a chemical element with atomic number 39 which means there are 39 protons and 39 electrons in the atomic structure. Tungsten is an intrinsically brittle and hard material, making it difficult to work. Bismuth is a pentavalent post-transition metal and one of the pnictogens, chemically resembles its lighter homologs arsenic and antimony. The free element, produced by reductive smelting, is a hard, lustrous, silver-gray metal. Neodymium is a chemical element with atomic number 60 which means there are 60 protons and 60 electrons in the atomic structure. Caesium is a soft, silvery-gold alkali metal with a melting point of 28.5 °C, which makes it one of only five elemental metals that are liquid at or near room temperature. Rhenium is a chemical element with atomic number 75 which means there are 75 protons and 75 electrons in the atomic structure. The chemical symbol for Einsteinium is Es. The chemical symbol for Iodine is I. Iodine is the heaviest of the stable halogens, it exists as a lustrous, purple-black metallic solid at standard conditions that sublimes readily to form a violet gas. Lithium is a chemical element with atomic number 3 which means there are 3 protons and 3 electrons in the atomic structure. It is one of the least reactive chemical elements and is solid under standard conditions. The chemical symbol for Protactinium is Pa. Protactinium is a dense, silvery-gray metal which readily reacts with oxygen, water vapor and inorganic acids. Lead has the highest atomic number of any stable element and concludes three major decay chains of heavier elements. The chemical symbol for Berkelium is Bk. Nitrogen-13 is used in PET (positron emission tomography) scans by physicians to monitor brain activity and diagnose dementia. Plutonium is a chemical element with atomic number 94 which means there are 94 protons and 94 electrons in the atomic structure. The chemical symbol for Argon is Ar. 1) You may use almost everything for non-commercial and educational use. The chemical symbol for Caesium is Cs. Neptunium is the first transuranic element. These have similar chemical properties, but palladium has the lowest melting point and is the least dense of them. Mercury is commonly known as quicksilver and was formerly named hydrargyrum. It is obtained chiefly from the mineral cassiterite, which contains tin dioxide. The chemical symbol for Plutonium is Pu. The chemical symbol for Zirconium is Zr. Astatine is the rarest naturally occurring element on the Earth’s crust. The chemical symbol for Hydrogen is H. With a standard atomic weight of circa 1.008, hydrogen is the lightest element on the periodic table. It may seem, that the space and in fact the matter is empty, but it is not. Nitrogen is a chemical element with atomic number 7 which means there are 7 protons and 7 electrons in the atomic structure. The chemical symbol for Erbium is Er. Oxygen is a colourless, odourless reactive gas, the chemical element of atomic number 8 and the life-supporting component of the air. Samarium is a typical member of the lanthanide series, it is a moderately hard silvery metal that readily oxidizes in air. It is a member of the chalcogen group on the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds. The chemical symbol for Rhodium is Rh. Hassium is a chemical element with symbol Hs and atomic number 108. The first alloy used on a large scale was bronze, made of tin and copper, from as early as 3000 BC. Berkelium is a chemical element with atomic number 97 which means there are 97 protons and 97 electrons in the atomic structure. The O2− Ion Has _____ Protons And _____ Electrons. The chemical symbol for Thallium is Tl. The chemical symbol for Barium is Ba. Bismuth is a brittle metal with a silvery white color when freshly produced, but surface oxidation can give it a pink tinge. The chemical symbol for Californium is Cf. A major development was the discovery that steel could be made highly resistant to corrosion and discoloration by adding metallic chromium to form stainless steel. The chemical symbol for Yttrium is Y. Yttrium is a silvery-metallic transition metal chemically similar to the lanthanides and has often been classified as a “rare-earth element”. The chemical symbol for Silicon is Si. Lanthanum is a soft, ductile, silvery-white metal that tarnishes rapidly when exposed to air and is soft enough to be cut with a knife. If an ion has a 2+ charge, like Zn 2+, this means there are two more protons than electrons. Lead is a heavy metal that is denser than most common materials. For example, atomic number of nitrogen is 7 and in a ion there will be 7 + 3 = 10 electrons and there will be 7 protons. The volume of an atom is about 15 orders of magnitude larger than the volume of a nucleus. a single carbon atom can form a maximum of ________ covalent bond(s). Approximately 60–70% of thallium production is used in the electronics industry. The classical description cannot be used to describe things on the atomic scale. The densest material found on earth is the metal osmium, but its density pales by comparison to the densities of exotic astronomical objects such as white dwarf stars and neutron stars. Nitrogen has seven protons, 2 protons on the 1st shell, and 5 protons on the second. Cobalt is a chemical element with atomic number 27 which means there are 27 protons and 27 electrons in the atomic structure. Holmium is a part of the lanthanide series, holmium is a rare-earth element. Help your mates do their homework and share Top Homework Answers with them, it’s completely free and easy to use! Like the other metals of the platinum group, ruthenium is inert to most other chemicals. In the periodic table, potassium is one of the alkali metals. The chemical symbol for Helium is He. Thallium is a soft gray post-transition metal is not found free in nature. Bromine is a chemical element with atomic number 35 which means there are 35 protons and 35 electrons in the atomic structure. Xenon is a chemical element with atomic number 54 which means there are 54 protons and 54 electrons in the atomic structure. The Van der Waals radius, rw, of an atom is the radius of an imaginary hard sphere representing the distance of closest approach for another atom. Rhodium is a rare, silvery-white, hard, corrosion resistant and chemically inert transition metal. Tellurium is chemically related to selenium and sulfur. Melting point of Nitrogen is -209,9 °C and its the boiling point is -195,8 °C. Palladium, platinum, rhodium, ruthenium, iridium and osmium form a group of elements referred to as the platinum group metals (PGMs). Arsenic occurs in many minerals, usually in combination with sulfur and metals, but also as a pure elemental crystal. Ytterbium is a chemical element with atomic number 70 which means there are 70 protons and 70 electrons in the atomic structure. Holmium is a chemical element with atomic number 67 which means there are 67 protons and 67 electrons in the atomic structure. The chemical symbol for Palladium is Pd. Platinum is one of the least reactive metals. Where more than one isotope exists, the value given is the abundance weighted average. But this “huge” space is occupied primarily by electrons, because the nucleus occupies only about 1721×10−45 m3 of space. 30 - 2 = 28 electrons Copper is used as a conductor of heat and electricity, as a building material, and as a constituent of various metal alloys, such as sterling silver used in jewelry, cupronickel used to make marine hardware and coins. It must be noted, atoms lack a well-defined outer boundary. Naturally occurring potassium is composed of three isotopes, of which 40K is radioactive. All atoms of an element have the same atomic number. Atomic weight of Nitrogen is 14.007 u or g/mol. If we include man made elements, the densest so far is Hassium. Argon is a chemical element with atomic number 18 which means there are 18 protons and 18 electrons in the atomic structure. Cerium is a soft, ductile and silvery-white metal that tarnishes when exposed to air, and it is soft enough to be cut with a knife. Germanium is a chemical element with atomic number 32 which means there are 32 protons and 32 electrons in the atomic structure. Iodine is a chemical element with atomic number 53 which means there are 53 protons and 53 electrons in the atomic structure. Californium is an actinide element, the sixth transuranium element to be synthesized, and has the second-highest atomic mass of all the elements that have been produced in amounts large enough to see with the unaided eye (after einsteinium). Polonium is a chemical element with atomic number 84 which means there are 84 protons and 84 electrons in the atomic structure. Chromium is a steely-grey, lustrous, hard and brittle metal4 which takes a high polish, resists tarnishing, and has a high melting point. Although neodymium is classed as a rare earth, it is a fairly common element. The number of neutrons is equal to the difference between the mass number of the atom (M) and the atomic number … Only about 5×10−8% of all matter in the universe is europium. Despite its high price and rarity, thulium is used as the radiation source in portable X-ray devices. 2 are core electrons and 5 are valence electrons (2+5). Nitrogen is the chemical element with the symbol N and atomic number 7. Because nitrogen has an atomic weight of 14.007 amu, its mass number is 14. The chemical symbol for Indium is In. Barium is a chemical element with atomic number 56 which means there are 56 protons and 56 electrons in the atomic structure. Determine the number of electrons. Fluorine is a chemical element with atomic number 9 which means there are 9 protons and 9 electrons in the atomic structure. Nitrogen is a colourless, odourless unreactive gas that forms about 78% of the earth’s atmosphere. If you continue to use this site we will assume that you are happy with it. Sodium is a soft, silvery-white, highly reactive metal. Nickel is a chemical element with atomic number 28 which means there are 28 protons and 28 electrons in the atomic structure. It is by mass the most common element on Earth, forming much of Earth’s outer and inner core. A nitrogen atom has 7 protons, and its most common isotope has 7 neutrons. Europium is a chemical element with atomic number 63 which means there are 63 protons and 63 electrons in the atomic structure. Erbium is a silvery-white solid metal when artificially isolated, natural erbium is always found in chemical combination with other elements. Carbon is the 15th most abundant element in the Earth’s crust, and the fourth most abundant element in the universe by mass after hydrogen, helium, and oxygen. The atomic number communicates how many protons an element possesses. Zinc is a chemical element with atomic number 30 which means there are 30 protons and 30 electrons in the atomic structure. Due to the quantum nature of electrons, the electrons are not point particles, they are smeared out over the whole atom. It is the eponym of the lanthanide series, a group of 15 similar elements between lanthanum and lutetium in the periodic table, of which lanthanum is the first and the prototype. Nobelium is the tenth transuranic element and is the penultimate member of the actinide series. Lutetium is a chemical element with atomic number 71 which means there are 71 protons and 71 electrons in the atomic structure. Lanthanoids comprise the 15 metallic chemical elements with atomic numbers 57 through 71, from lanthanum through lutetium. N all by itself has 7 electrons. Liquid nitrogen (made by distilling liquid air) boils at 77.4 kelvins (−195.8°C) and is used as a coolant. Gadolinium is a chemical element with atomic number 64 which means there are 64 protons and 64 electrons in the atomic structure. Rhenium is a silvery-white, heavy, third-row transition metal in group 7 of the periodic table. Platinum is used in catalytic converters, laboratory equipment, electrical contacts and electrodes, platinum resistance thermometers, dentistry equipment, and jewelry. It has an atomic number of 7, so it also has seven protons. The chemical symbol for Radium is Ra. Berkelium is a member of the actinide and transuranium element series. Scandium is a chemical element with atomic number 21 which means there are 21 protons and 21 electrons in the atomic structure. Gallium is a chemical element with atomic number 31 which means there are 31 protons and 31 electrons in the atomic structure. The name xenon for this gas comes from the Greek word ξένον [xenon], neuter singular form of ξένος [xenos], meaning ‘foreign(er)’, ‘strange(r)’, or ‘guest’. Krypton is a chemical element with atomic number 36 which means there are 36 protons and 36 electrons in the atomic structure. Francium is an alkali metal, that has one valence electron. www.nuclear-power.net. Uranium is a silvery-white metal in the actinide series of the periodic table. Discoverer: Coster, Dirk and De Hevesy, George Charles, Discoverer: Elhuyar, Juan José and Elhuyar, Fausto, Discoverer: Noddack, Walter and Berg, Otto Carl and Tacke, Ida. The chemical symbol for Actinium is Ac. We use cookies to ensure that we give you the best experience on our website. Cadmium is a chemical element with atomic number 48 which means there are 48 protons and 48 electrons in the atomic structure. Radon is a radioactive, colorless, odorless, tasteless noble gas. Students Also Read An Introduction to Atomic Number, Isotopes and Isobars Because of its closed-shell electron configuration, its density and melting and boiling points differ significantly from those of most other lanthanides. For each isotope, give the following information: (a) the number of protons; (b) the number of neutrons; Rhodium is a chemical element with atomic number 45 which means there are 45 protons and 45 electrons in the atomic structure. In nuclear industry gadolinium is commonly used as a neutron absorber due to very high neutron absorbtion cross-section of two isotopes 155Gd and 157Gd. The chemical symbol for Zinc is Zn. Indium is a post-transition metal that makes up 0.21 parts per million of the Earth’s crust. Iridium is a chemical element with atomic number 77 which means there are 77 protons and 77 electrons in the atomic structure. and Gay-Lussac, L.-J. The most probable fission fragment masses are around mass 95 (Krypton) and 137 (Barium). The chemical symbol for Gallium is Ga. Gallium has similarities to the other metals of the group, aluminium, indium, and thallium. E. Discoverer: De Marignac, Charles Galissard, Discoverer: De Marignac, Jean Charles Galissard, Discoverer: Göhring, Otto and Fajans, Kasimir. The chemical symbol for Holmium is Ho. The chemical symbol for Rhenium is Re. Antimony compounds have been known since ancient times and were powdered for use as medicine and cosmetics, often known by the Arabic name, kohl. Given in the atomic structure similarly coloured gas its physical and chemical properties of astatine are not with... Containing phosphate mineral ) 15 protons and neutrons describe things on the Earth s... Grayish metal naturally found in the atomic structure and water radiation source in portable devices! Around mass 95 ( krypton ) and is a chemical element with atomic number 7 majority! Color when freshly produced, but also as a pure elemental crystal 64 electrons in the atomic.. 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