1, 3, 5, and 7. Lead is a chemical element with atomic number 82 which means there are 82 protons and 82 electrons in the atomic structure. Because of this, the first two rows of the periodic table are labeled the s block. 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). Electron configuration: [Xe]4f 6 5s 2 Valences: +2, +3 Electronegativity:1.17 Neodymium is a soft silvery metal that tarnishes in air. Promethium is one of only two such elements that are followed in the periodic table by elements with stable forms. Because of its closed-shell electron configuration, its density and melting and boiling points differ significantly from those of most other lanthanides. Uranium has the highest atomic weight of the primordially occurring elements. Bromine is a chemical element with atomic number 35 which means there are 35 protons and 35 electrons in the atomic structure. Elemental sulfur is a bright yellow crystalline solid at room temperature. Like the other metals of the platinum group, ruthenium is inert to most other chemicals. Silicon is a chemical element with atomic number 14 which means there are 14 protons and 14 electrons in the atomic structure. Francium is a chemical element with atomic number 87 which means there are 87 protons and 87 electrons in the atomic structure. … Liquid nitrogen (made by distilling liquid air) boils at 77.4 kelvins (−195.8°C) and is used as a coolant. Under the orbital approximation, we let each electron occupy an orbital, which can be solved by a single wavefunction. 2 12--69 Tm. Its boiling point is the lowest among all the elements. Thanks for any help! Curium is a chemical element with atomic number 96 which means there are 96 protons and 96 electrons in the atomic structure. 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f6 6s2. The chemical symbol for Tantalum is Ta. Krypton is a member of group 18 (noble gases) elements. Calcium is a chemical element with atomic number 20 which means there are 20 protons and 20 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. In nuclear industry cadmium is commonly used as a thermal neutron absorber due to very high neutron absorption cross-section of 113Cd. Francium is an alkali metal, that has one valence electron. Caesium has physical and chemical properties similar to those of rubidium and potassium. Oxidation states are typically represented by integers which may be positive, zero, or negative. Tantalum is a rare, hard, blue-gray, lustrous transition metal that is highly corrosion-resistant. It could be part of the main body, but then the periodic table would be rather long and cumbersome. Thallium is a chemical element with atomic number 81 which means there are 81 protons and 81 electrons in the atomic structure. As an approximate rule, electron configurations are given by the Aufbau principle and the Madelung rule. Discoverer: Marinsky, Jacob A. and Coryell, Charles D. and Glendenin, Lawerence. Silver is a chemical element with atomic number 47 which means there are 47 protons and 47 electrons in the atomic structure. The chemical symbol for Ytterbium is Yb. … The current IUPAC Gold Book definition of oxidation state is: “Oxidation state of an atom is the charge of this atom after ionic approximation of its heteronuclear bonds…”. Platinum is used in catalytic converters, laboratory equipment, electrical contacts and electrodes, platinum resistance thermometers, dentistry equipment, and jewelry. The chemical symbol for Zinc is Zn. Argon is mostly used as an inert shielding gas in welding and other high-temperature industrial processes where ordinarily unreactive substances become reactive; for example, an argon atmosphere is used in graphite electric furnaces to prevent the graphite from burning. Chromium is a chemical element with atomic number 24 which means there are 24 protons and 24 electrons in the atomic structure. And manganese silvery-white metal, particularly in stainless steels electronic configuration also the most common element exposed surface of copper... Densities of exotic astronomical objects such as white dwarf stars and neutron stars radioactive isotope.... Has one valence electron be about three times more abundant than uranium results in negative... 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