Holmium is a relatively soft and malleable silvery-white metal. Lutetium is a chemical element with atomic number 71 which means there are 71 protons and 71 electrons in the atomic structure. In nuclear industry cadmium is commonly used as a thermal neutron absorber due to very high neutron absorption cross-section of 113Cd. Lead is widely used as a gamma shield. Chromium is a steely-grey, lustrous, hard and brittle metal4 which takes a high polish, resists tarnishing, and has a high melting point. 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. All of the alkali metals have a single valence electron in the outer electron shell, which is easily removed to create an ion with a positive charge – a cation, which combines with anions to form salts. Tellurium is a brittle, mildly toxic, rare, silver-white metalloid. Tin is a post-transition metal in group 14 of the periodic table. Argon is the third-most abundant gas in the Earth’s atmosphere, at 0.934% (9340 ppmv). The chemical symbol for Dysprosium is Dy. Zinc is a chemical element with atomic number 30 which means there are 30 protons and 30 electrons in the atomic structure. Thallium is a chemical element with atomic number 81 which means there are 81 protons and 81 electrons in the atomic structure. Elemental rubidium is highly reactive, with properties similar to those of other alkali metals, including rapid oxidation in air. The chemical symbol for Neodymium is Nd. The chemical symbol for Promethium is Pm. If an ion has a 2+ charge, like Zn 2+, this means there are two more protons than electrons. Its properties are thus intermediate between those of chlorine and iodine. Zirconium is widely used as a cladding for nuclear reactor fuels. It has remarkable resistance to corrosion, even at high temperatures, and is therefore considered a noble metal. The chemical symbol for Neptunium is Np. Carbon is one of the few elements known since antiquity. Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure. Cerium is a chemical element with atomic number 58 which means there are 58 protons and 58 electrons in the atomic structure. Americium is a transuranic member of the actinide series, in the periodic table located under the lanthanide element europium, and thus by analogy was named after the Americas. 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. Determine the number of electrons. The chemical symbol for Palladium is Pd. The chemical symbol for Thallium is Tl. B) The nitrogen atom has a mass number of approximately 14 and an atomic number … The chemical symbol for Nitrogen is N. Nitrogen is a colourless, odourless unreactive gas that forms about 78% of the earth’s atmosphere. Therefore, an element in a neutral state will have the same number of protons and electrons. N all by itself has 7 electrons. Gold is thought to have been produced in supernova nucleosynthesis, from the collision of neutron stars. The chemical symbol for Krypton is Kr. It has an estimated density of 40.7 x 103 kg/m3. The chemical symbol for Hafnium is Hf. The chemical symbol for Caesium is Cs. The chemical symbol for Astatine is At. Neodymium is not found naturally in metallic form or unmixed with other lanthanides, and it is usually refined for general use. Ruthenium is a chemical element with atomic number 44 which means there are 44 protons and 44 electrons in the atomic structure. Germanium is a chemical element with atomic number 32 which means there are 32 protons and 32 electrons in the atomic structure. The bulk properties of astatine are not known with any certainty. Fermium is a chemical element with atomic number 100 which means there are 100 protons and 100 electrons in the atomic structure. The chemical symbol for Radon is Rn. The chemical symbol for Potassium is K. Potassium was first isolated from potash, the ashes of plants, from which its name derives. Zirconium is mainly used as a refractory and opacifier, although small amounts are used as an alloying agent for its strong resistance to corrosion. Write the atomic number andmass number of this radioactive nitrogen as a chemicalsymbol with a subscript and superscript. Fermium is a member of the actinide series. Tungsten is a chemical element with atomic number 74 which means there are 74 protons and 74 electrons in the atomic structure. Its physical and chemical properties are most similar to its heavier homologues strontium and barium. Rubidium is a chemical element with atomic number 37 which means there are 37 protons and 37 electrons in the atomic structure. Lawrencium is the final member of the actinide series. It must be noted, atoms lack a well-defined outer boundary. The most stable known isotope, 269Hs, has a half-life of approximately 9.7 seconds. Holmium is a part of the lanthanide series, holmium is a rare-earth element. Sulfur is a chemical element with atomic number 16 which means there are 16 protons and 16 electrons in the atomic structure. The chemical symbol for Tin is Sn. 1) You may use almost everything for non-commercial and educational use. Due to the quantum nature of electrons, the electrons are not point particles, they are smeared out over the whole atom. Actinium is a soft, silvery-white radioactive metal. Krypton is a member of group 18 (noble gases) elements. 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