| 1. What conditions in the atmosphere need to be
considered in classifying air as either a homogenous
or heterogenous mixture?

Air is said to be Homogeneous mixture of different gases because it contains different gases like Nitrogen ,oxygen, carbon dioxide, argon, etc. This is said to be homogeneous mixture because the constituent cannot be distinguished unlike heterogeneous mixture

Explanation:

"the periodic table is arranged in order of atomic number."