Question: A. A main group element with the valence electron configuration 5s2 is in periodic group It forms a monatomic ion with a charge of B.

 A. A main group element with the valence electron configuration 5s2

A. A main group element with the valence electron configuration 5s2 is in periodic group It forms a monatomic ion with a charge of B. A main group element with the valence electron configuration 4s24p5 is in periodic group It forms a monatomic ion with a charge of 9 more group attempts remaining

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