Calcium Chlorine Molecular Formula?

Question

Hello! I have a big problem on this question and I can't figure it out, this is the only question I have throughout my whole assignment.

Here's the question:

Calcium (20Ca) and chlorine (17Cl) can combine to form the salt calcium chloride. Based on the number of electrons in their valence shells and their bonding capacities, what would the molecular formula for this salt be? a. __________

Which atom becomes the cation? b. ________

Thanks in advance. :D

Answer 1

Ca has a +2 valence and Cl has -!. So the formula is CaCl2

calcium is the cation (donates the electrons) and chlorine is the anion (receives)