Question

ionic compound formulas
an ionic compound made from calcium and chlorine,
what is the formula for the ionic compound made from calcium (ca) and chlorine (cl)?
ca and is in group 2,
cl and is in group 7a or 17,
cl₂ca
clca
cacl₂
ca₂cl

Explanation:

Step1: Determine calcium ion charge

Calcium in group 2 loses 2 electrons, forming $Ca^{2 + }$.

Step2: Determine chlorine ion charge

Chlorine in group 17 gains 1 electron, forming $Cl^{-}$.

Step3: Balance charges

To balance the +2 charge of calcium, we need 2 chloride ions. So the formula is $CaCl_{2}$.

Answer:

$CaCl_{2}$