An atom has the following electron configuration. 1s22s22p 3s23p3
How many valence electrons does this atom have? (4 points)
3
5
8.
15

Which formula can be used to calculate the molar mass of ammonia (nh3)? molar mass of n + molar mass of h 3 × molar mass of n + molar mass of h molar mass of n + 3 × molar mass of h 3 × molar mass of n + 3 × molar mass of h

1. list three scientific reasons cockroaches may fly.

Water's surface tension and heat storage capacity are accounted for by its a) orbitals b) weight c) hydrogen bonds d) mass e) size