Yes, this is probably the simplest question of this Chapter! There is a 4 at the bottom of P, so, its atomicity is 4.
One of the most common substances to be found on Earth is Water. Water molecules are made up of 2 atoms of H and 1 atom of O. So, its chemical formula is H2O.
From the table, what is the mass of 1 molecule of water?
• $$16 \, \mathrm{amu}$$
• $$2 \, \mathrm{amu}$$
• $$17 \, \mathrm{amu}$$
• $$18 \, \mathrm{amu}$$