Question

What is the formula of the compound formed between chlorine (Cl) and calcium (Ca)?

A. CaCl, because calcium loses one electron and chlorine gains one electron.
B. ClCa, because chlorine gains one electron and calcium loses one electron.
C. CaCl2, because calcium loses two electrons and chlorine gains one electron.
D. ClCa2, because chlorine gains one electron and calcium loses two electrons.

Answer 1

C.

Step-by-step explanation:

From the periodic table: Cl has a -1 charge while Ca has a +2

This means that 2 Cl required to make a neutral compound with Ca (ideal)