Question

question 2
how can you tell when a new element symbol is starting in a chemical formula?
look for the capital letter
look for the arrow
look for the coefficient
look for the subscript

Explanation:

In a chemical formula, each new element symbol starts with a capital letter. For example, in H₂O, "H" is for hydrogen and "O" is for oxygen, and the capital - starting letters mark the start of a new element symbol.

Answer:

look for the capital letter