Final answer:
A water molecule (H22O) consists of two hydrogen (H) atoms and one oxygen (O) atom. The total number of valence electrons in a water molecule is 8.
Step-by-step explanation:
The water molecule (H2O) consists of two hydrogen (H) atoms and one oxygen (O) atom. Each hydrogen atom has 1 valence electron, and oxygen atom has 6 valence electrons. Therefore, the total number of valence electrons in a water molecule is 8 (2 + 6).