Question

_ mg+_O2----_mgo balance the following equation​

Answer 1

2 Mg(s) + O2(g) → 2 MgO(s)

As magnesium (Mg) has a valency of +2, and oxygen (O) has a valency of -2, the ratio would be 1:1, and magnesium oxide would be represented as MgO. The number of atoms of each element on reactant and product side must be equal. That is the basic principle for balancing an equation.

Answer 2

2Mg+O2$\huge\bold\color{black}{\implies}$2MgO