Question

In the formula of water , H2O, what is the number 2 called?

Answer 1

The 2 is a Subscript

Answer 2

Subscript Text

Step-by-step explanation:

The small 2 seen in H2O is used to mark down the number of atoms (H) present, so in H2O's case (Dihydrogen Monoxide) there are 2 Hydrogen atoms present.