Each compound and element present in air has its own atomic or molecular mass. Determine the molecular mass of each of these substances. Be sure to write out your calculations to show how you found them.
a. Nitrogen (N2)
b. Oxygen (O2)
c. Argon (Ar)
d. Carbon dioxide (CO2)

why is arctic sea ice important? arctic sea ice keeps the polar regions cool and moderate global climate. sea ice has a bright surface; 80 percent of the sunlight that strikes it is reflected back into space. as sea ice melts in the summer, it exposes the dark ocean surface.

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.