NDA 2022 Chemistry question

Which one of the following is the correct order of the valencies of elements Ne, Si, N and Mg ?

Answer: (A)

Solution

Valency from electronic configuration: Ne (2, 8) has a complete octet, valency 0; Mg (2, 8, 2) loses two electrons, valency 2; N (2, 5)

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Question ID VK-032054