Calcium atoms have two electrons in the outermost shell. as a result, you would expect calcium to form ions with a charge of
a) +1.
b) +2.
c) -1.
d) -2.
e) 0.

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?