# How do you name and classify Kr and Xe?

$\text{Krypton, Z = 36}$ and $\text{xenon, Z = 54}$, are Noble Gases, with limited reactivity compared to other elements. Both of these are room temperature, mono-atomic gases. The normal boiling point of xenon is $- 162.6$ ""^@C; that of krypton is $- 157.4$ ""^@C