The electric configurations of four particles A, B, C and D are given below

A 2, 8, 8


B 2, 8, 2


C 2, 6


D 2, 8


Which electronic configuration represents:


(i) magnesium atom?


(ii) oxygen atom?


(iii) sodium ion?


(iv) chloride ion?

(i) magnesium atom has atomic number 12 so the answer is B.

(ii) C will be the desired answer as atomic number of oxygen atom is 8.


(iii) D represents the sodium ion, as it has E.C of 2,8.


(iv) A represents chloride ion because it has E.C of 2, 8, 8.


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