1. a)c-14 has two more protons
2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.
3. c) iron and nickel.
the correct name for the n3 ion is azide. azide is a polyatomic anion with a -1 charge and is written as n3 -1. it consists of three nitrogen atoms bonded together. hope i . let me know if you need anything else.