How many atoms are in Na2CrO4

The formula shows the number of each type of atom in the molecule. There are 2 atoms of sodium, one atom of chromium and four atoms of oxygen, being a total number of 7 atoms.

Well it is McKinley, for two reasons. 

One, it is not a volcano, so that automatically rules it out. 

And two, it is in Alaska, which is not even in the Cascade Range, which runs from southern B.C. (technically) to northern California. 

Hood, St. Helens, and Shasta are all volcanoes within the Cascade Range.