Question

how many of each?
number of molecules
total number of atoms
types of atoms

Explanation:

Step1: Count the number of molecules

The diagram shows one water molecule ($H_2O$).

Step2: Calculate the total number of atoms

In a water molecule ($H_2O$), there are 2 hydrogen ($H$) atoms and 1 oxygen ($O$) atom. So, $2 + 1=3$ atoms in total.

Step3: Determine the types of atoms

The types of atoms are hydrogen ($H$) and oxygen ($O$), so 2 types.

Answer:

Number of Molecules: 1, TOTAL number of Atoms: 3, TYPES of Atoms: 2