Answer:
17 electrons
Potassium normally has 19 electrons but the +2 implies that Potassium lost 2 electrons making the total be 17 electrons
The classic case of ionic bonding, the sodium chloride molecule forms by the ionization of sodium and chlorine atoms and the attraction of the resulting ions. An atom of sodium has one 3s electron outside a closed shell, and it takes only 5.14 electron volts of energy to remove that electron.
When you combine any thing together that you cant take apart is a Physical Change.
1.67377x10-27 kilogram(kg) or 1.67377x 10-24 gram(g)
