Identify the atomic numbers of the pair of elements which possesses same number of electrons in L and M shells.

Options

A. 12 , 18
B. 19 , 20
C. 18 , 16
D. 17 , 18

Answer

2

Explanation

`{:("Atomic number (z)"," Electronic configuration"),(" "19," "2_(,)8_(,)8_(,)1),(" "20," "2_(,)8_(,)8_(,)2):}`