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buffalo buffalo
wrote...
11 years ago
A nucleus of mass number 209 contains 126 neutrons. An atomic ion of this element has 80 electrons in it. Write the symbol for this atomic ion (give the symbol for the nucleus and give the ionic charge as a right superscript).
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wrote...
11 years ago
Mass Number 209-Number of Neutrons 126=83 Protons
83 Protons-80 Electrons= +3
Lead's Atomic Number is 209

Pb+3
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