Question

Among the following groups of elements, the atoms of which groups have one electron in their outermost (valence) shell ? (A) C, Si, P (B) Li, Na, K, (C) Ca, Mg, Ra (D) B, Al, Ga​

Answer 1

Answer:

(B) Li, Na, K

Explanation:

Electronic configuration of:

Li - 2,1

Na - 2,8,1

K - 2,8,8,1

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