Question

Helium has ___ valence electrons and has valency of ___.

• A. two
• B. zero

Answer 1

• The atomic number of helium is 2.
• The electronic configuration of helium is 2.
• The electrons present in the outermost shell i.e 'K' is 2 and the octet of helium is complete.
• As the octet of helium is complete, it will neither lose nor gain electrons, therefore the valency of helium will be zero and it will remain inert.

Therefore, Helium has two valence electrons and has a valency of zero.