Answer to Question #301619 in General Chemistry for Jewel

Question

FeCl2 NiSO4 CuSO4 Cr(NO3)3

which of the compound cointains an ion with 2+ Charge? And why?

Answer 1

FeCl2

If an ion has a 2+ charge then it must have lost electrons to form the cation. If the ion has 18 electrons and the atom lost 2 to form the ion, then the neutral atom contained 20 electrons. Since it was neutral, it must also have had 20 protons. Therefore the element is calcium.