Answer:
Kr, Krypton is a noble gas
Step-by-step explanation:
it is in group 8a on the periodic table.
ps...this is chemistry, not math
Kr - Krypton
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
