Question

Which of the following electronic configuration represents a noble gas?

• A. 2
• B. 2, 8, 8, 2
• C. 2, 8, 6
• D. 2, 8, 2

Answer 1

The correct option is A

2

Since, noble gases have stable elecetronic configuration, thats their octet or duplet(in case of helium) of electrons is complete.

Therefore,2 is the electronic configuration of Helium which is a noble gas.

Atomic number of helium = 2

Therefore number of electrons = 2

Therefore, electronic configuration of helium is 2.(K shell)