Question

The electronic configuration of an element with atomic number 19 will be :
1) 2,9,8
2) 2,8,9
3) 2,8,8,1
4) 2,10,7

Answer 1

Atomic number = 19
i.e. element is pottasium ( K )
Number of electron
k= 2
L = 8
M = 8
n = 1

Hence the electronic configuration is 2,8,8,1

Answer 2

The electronic configuration of an element with atomic number 19 will be :
3) 2,8,8,1