The subscript tells you how many of each element there is. If there is no subscript, there is only one of that element.

​subscripts

Each capital letter is a different element.

​Atomic Symbol

Formulas have two parts

Some text here about the topic of discussion

The letter H is the atomic symbol for hydrogen. The letter O is the atomic symbol for oxygen. ​There is a 2 for the subscript of hydrogen and oxygen doesn't have a subscript. So how many atoms and elements are in water?

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