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What atom or ion make up 2 protons and 10 electrons?
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What atom or ion make up 2 protons and 10 electrons?

User Rangooski
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The atom that is made up of two protons is He. The number of neutrons is also two. The number of electrons matters in the charge. So to make 10 electrons, we add 8 more. hence, 4/2 He 8-. 
User John Mulder
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