A. A main group element with the valence electron configuration 2s 2 2p 5 is in periodic
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A. A main group element with the valence electron configuration 2s 2 2p 5 is in periodic group .
It forms a monatomic ion with a charge of .
B. A main group element with the valence electron configuration 4s 2 is in periodic group .
It forms a monatomic ion with a charge of .
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