Question

Which element is a noble gas?
Sr As or Kr

Answer 1

Kr, Krypton is a noble gas

Explanation:

it is in group 8a on the periodic table.

ps...this is chemistry, not math

Answer 2

Kr - Krypton

Explanation:

Kr has an atomic number of 36 and falls under group 8. This can be determined also using the KLMN shells. so for Kr we have;

k=2, L=8, M=18, N=8