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ARC-Challenge / Mercury_7133945 / In order to determine if two atoms are copper (Cu) atoms, what must be the same…

Problem

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question

In order to determine if two atoms are copper (Cu) atoms, what must be the same for each?

choices

  • the number of valence electrons
  • the number of protons
  • the charge of the atom
  • the size of the atom

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Source and history

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