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has 6 protons and the atomic number is 6 the atomic mass is 12.011 the amount of electrons 2 and 4 there are 6 neutrons this item was discovered in 3750 BC

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arsenic has 33 protons and 42 neutrons  and has five electrons this element is called a metaloid. the atomic mass is 74.9216 the atomic number is 33 arsenic was discovered in in 1250

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krypton has 36 protons and 36 electrons krypton has 48 neutrons the atomic mass is 83.8 the element was discovered in 1898

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the amount of protons in xenon is 54 its colorless and odorless the 3d shell in electrons is 18 and the atomic number is 54 and the atomic mass is 131.293 this element was discovered in 1898

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iridium has 77 protons and the atomic number is 77 the atomic mas of iridium is 192.217 iridium has 115 neutrons and has 77 electrons  discoverd in 1803

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the atomic number is 78 the abbreviation is pt the atomic mas is 195.084 and the number of electrons 78 there is 177 neutrons and 78 protons this element was discovered in1735

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the atomic number in iron is 26 and the abbreviation is FE the atomic mass 55.845 and it has 26 protons and neutrons 30 and the electrons is 26 discovered in 3000 BC

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zincs atomic number is 30 the abbreviation is ZE the atomic mass is 65.38 the protons is 30 and neutrons is 35 and its was discovered in 1746