How does the size of a barium ion compare to the size of a barium atom? The ion is smaller because it has fewer electrons. Can someone explain why this is the answer, I really don't understand.

In a laboratory, 1.55mg of an organic compound containing carbon, hydrogen, and oxygen is burned for analysis. this combustion resulted in the formation of 1.45mg of carbon dioxide and .89 mg of water. what is the empirical formula for this compound?

What if it is did darwin used to support his theory of evolution

Select the correct answer. wax is a nonpolar substance. in which type of substance is it the most soluble?