Question

1. 2znso4 # of molecules: 2 # of elements: 3 name of element: zn=zinc s=sulfur o=oxygen # of atoms: 2 2 8 total # of atoms: 12 the #4 is a (coefficient or subscript)

Explanation:

Step1: Identify the meaning of coefficient and subscript

A coefficient is the number in front of a chemical formula indicating the number of molecules. A subscript is a number written below and to the right of a chemical symbol indicating the number of atoms of that element in one - molecule of the compound.
In the formula $2ZnSO_4$, the number 2 in front is the coefficient, and the 4 in $SO_4$ is a subscript. It indicates that in one molecule of $SO_4$, there are 4 oxygen atoms.

Answer:

subscript