Question

9. Electronic configuration of elements A,B,C,D are given.
A = 2,7
B = 2,8,1
C = 2,8,8
D = 2,8.7
a) Which among the above is a noble gas
?
b)Which of the elements belong to the same group ?​

Answer 1

Answer:

a) 2,8,8

b)2,8,1. 2,8,7,. 288

sodium, chlorine, argon

Answer 2

Answer:

a)2,8,8

b)2,8,1. 2,8,7. 288

sodium, chlorine,argom