In No3-1 the oxidation number of oxygen is -5 so oxidation number of N would be +5
Explanation:
Magnesium has atomic number 12. It will be distributed in K, L, M shell in the following way:
K shell can accommodate a maximum of 2 electrons.
L shell can accommodate a maximum of 8 electrons and
M shell will accommodate 2 electrons
So the configuration becomes 2, 8,3
C. Also just look up a chemical equation balancer calculator next time.
D because it was abandoned