Question

Which among the pair of species is not of pseudo inert gas ion? (A) Nat. Ca2+ (B) Zn2+ Sn4+ (C) Sn2+. In + (D) Sc3+. Ti4+​

Answer 1

I can't understand that

Answer 2

Answer:

An element with pseudo noble/inert gas configuration has 18 electrons in the outermost shell instead of 8.

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