Question

Which of the following is a Nobel gas?

Ba2+
OA
OB. Ci
Kr
Ос.
Ca
D.

Answer 1

Kr

Step-by-step explanation:

the element that is in group 18 is noble gasses. the elements are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and oganesson (Og).