Answer
$2Ca(s)+O_{2}(g)\rightarrow 2CaO(g)$
Work Step by Step
Calcium reacts with dioxygen to form its oxide.
$Ca(s)+O_{2}(g)\rightarrow CaO(g)$
We can try to balance this equation.
Step 1: Balancing the number of O atoms
$Ca(s)+O_{2}(g)\rightarrow 2CaO(g)$
Step 2: Balancing the number of Ca atoms
$2Ca(s)+O_{2}(g)\rightarrow 2CaO(g)$
Equation is balanced in the above step.
