Sulfur Covalent Radius 1.02 Å Atomic Number 16 Learn more about the atomic number. Carbon is one of the few elements known since antiquity. Neon is a colorless, odorless, inert monatomic gas under standard conditions, with about two-thirds the density of air. Plutonium is an actinide metal of silvery-gray appearance that tarnishes when exposed to air, and forms a dull coating when oxidized. 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. The material has unusual optical and electrical properties. Bismuth is a chemical element with atomic number 83 which means there are 83 protons and 83 electrons in the atomic structure. Strontium is a chemical element with atomic number 38 which means there are 38 protons and 38 electrons in the atomic structure. P

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