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  3. Electronic configuration of an atom is 2,8,1. Which of the following elements is similar with it in chemical reactivity?

. Electronic configuration of an atom is 2,8,1. Which of the following elements is similar with it in chemical reactivity?

a. K

b. CI

C. n

D. Ar

Best Answer

Ans: a

Sol: Electronic configuration 2,8,1 is of sodium.

Potassium (K) and sodium (Na) both belong to the same group or the first group known as alkaline metals and have similar chemical reactivity.

 

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