Unit 2 Atomic Theory. Please help will give as much points as possible.

#1

Subtract no of electrons from no of protons

A=8-10=-2B=9-10=-1C=11-10=+1D=12-10=+2

Ion A has -2 charge

#2

Carbon has a atomic mass=12u

No of protons=6

No of electrons=6

Answer is G

The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.