1) I got Avogadro's number of these things.

2) I have shown that by taking Avogadro's number of individual ion pairs and putting them all together in a line, the system's energy became more negative.

3) And this is given the value the notation Avogadro's number we call it.

4) And we wrote something that looks, the energy is equal to minus the Madelung constant times Avogadro's number, 0R0 q1 q2 over 4 pi epsilon zero R zero.

5) It is joules per atom. Or, if you multiply by Avogadro's number then you will get joules per mole.