How do you count the total number of atoms present on one side of a chemical equation?

Explanation: We use a different element in the chemical equation.

We explain by a example

In this equation, we use the two elements Na and Cl.

Now, we count the number of atoms present on one side 2 atoms of Na and 2 atoms of Cl then the total numbers will be 4 .

But , we use a molecular formula then we count the number of each element of the molecular formula.

i believe the answer is a

the arctic is a region of the planet, north of the arctic circle, and includes the arctic ocean, greenland, baffin island, other smaller northern islands, and the far northern parts of europe, russia (siberia), alaska and canada.