How do calcium chloride and sodium chloride differ in chemical formula?

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A color-coded periodic table of the elements displays each element's symbol and atomic number, with categories such as alkali metals, noble gases, halogens, transition metals, and actinoid elements distinguished by different background colors. — alkaline-earth metal Modern version of the periodic table of the elements (printable).

The chemical formulas for calcium chloride and sodium chloride differ based on the valence of the metal cations involved in their respective ionic bonds.

Sodium chloride has the chemical formula NaCl. Sodium is an alkali metal that typically forms a cation with a +1 charge (Na⁺), which balances with a single chloride anion (Cl⁻).1
Calcium chloride has the chemical formula CaCl₂. Calcium is an alkaline-earth metal found in Group 2 of the periodic table. Because calcium typically forms a cation with a +2 charge, it requires two chloride anions to achieve a neutral chemical formula.23