Question

How many protons, neutrons, electrons, and what is the atomic number and atomic mass (if any) are in H₂O?

Answer 1

Protons: 10 (8 from Oxygen, 1 from each Hydrogen)
Neutrons: 8 (All from Oxygen, Hydrogen has 0)
Electrons: 10 (8 from O, 2 from each H)
Atomic Number: N/A, isn't a single element on the periodic table
Atomic Mass: 18 g/mol

Hope that helps!

Answer 2

Protons: Total of 10 - All oxygen

Electrons: Total of 10 - 8 from the oxygen atom & one from each of the hydrogen atoms

Neutrons - 8

One molecule of water is 18.015 amu.

Hope I was able to help!