Question

What are the positive and negative ions of sodium chloride and why? I don't get this topic am looking for a detailed explanation on this part of it. Thank you sooooo soooo much in advance!!

Answer 1

To understand this whole concept, we must look at ionic bonding.
Now how is KI formed?
Potassium atoms have nineteen electrons, looking at an elc. dot diagram that means 2,8,8,1 electrons in each shell of the electron cloud.
So there is only one electron in its outer shell. And that is what we care about.

Lets look at the chlorine atom, it has 17 electrons, looking at an elc. dot diagram that means 2,8,7 electrons in each shell of the electron cloud, 7 being in the outer valence.

Elemental atoms want stability. This means they all want EIGHT electrons in their outer valence.

This occurs by transfer of electrons. The metal loses the electrons, (in this case (1), now its 2,8,8) and the non metal gains them ( in this case (1) and the 7 becomes 8--> 2,8,8) due to difference in electronegativity (positive nuclei mass).

So because chlorine gained the electron, it is going to be a negatively charged chlorine ion, and potassium lost the electron it is going to become a positively charged potassium ion.

So do you get it?