Which represents the empirical formula for x4y8?

Explanation:

Molecular formula is the chemical formula which depicts the actual number of atoms of each element present in the compound.  

Empirical formula is the simplest chemical formula which depicts the whole number of atoms of each element present in the compound.

Given Molecular formula is , where in the ratio of atoms X and Y is 4: 8.

Thus the simplest ratio of atoms X and Y will be 1: 2.

The empirical formula will be .

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

geosphere and hydrosphere.

this is because the geosphere has to do with geological events, while the hydrosphere controls all water on earth.