How many ions are produced in solution by dissociation?

3 ions are produced 1 Co2 and 2 No3-1. Hope this helps

Yeah - I agree with the other user.

W\e have
NiCl2.6H2O(aq) --> Ni^+2 + 2Cl^-1
 3 ions: 1 Ni^+2 and 2 Cl^-1

There are 3 ions produced.

Good luck!

The teacher is mostly talking about the distillation of a mixture

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.