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What is the atomic mass of an ion that contains 87 protons 136 neutrons and 86 electrons?
Wiki User
∙ 11y ago
This is the ion of the isotope Pb-208 (Pb2+).
Daryl Kemmer
Wiki User
∙ 9y agoAn ion that contains 87 protons is an ion of the element francium, with symbol Fr. Because the ion contains one fewer electrons than protons, it must have an electrical charge of +1. The mass number equals the sum of the numbers of protons and electrons, 223 in this instance. A proper symbol for the ion is therefore 223Fr+ , in which the "223" and "+" should both be superscripts.
Wiki User
∙ 14y agoAs the electrons make up such a small mass relative to the numbers of the nucleons, we only need to add the numbers of protons and neutrons: 81 + 129 = 210.
Wiki User
∙ 11y agoMass number = protons + neutrons = 87 + 136 = 223
Wiki User
∙ 7y agoThis is the ion of the isotope Pb-208 (Pb2+).
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