Which greenhouse gas typically exists in both the stratosphere and the troposphere?

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)