Here's how to determine the number of valence electrons in C3O2:

1. Valence Electrons per Element:

* Carbon (C): 4 valence electrons

* Oxygen (O): 6 valence electrons

2. Total Valence Electrons:

* Carbon: 3 C atoms * 4 valence electrons/C atom = 12 valence electrons

* Oxygen: 2 O atoms * 6 valence electrons/O atom = 12 valence electrons

3. Total: 12 (C) + 12 (O) = 24 valence electrons

Therefore, C3O2 has 24 valence electrons.