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The nitrogen atom has 7 protons and 7 electrons, the nitride ion (N3-) will have:
(1) 7 protons and 10 electrons
(2) 4 protons and 7 electrons
(3) 4 protons and 10 electrons
(4) 10 protons and 7 electrons
Ans: 7 protons and 10 electrons
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