Answer:
A
Explanation:
The answer is A, when you drawing the electron diagrams for each element you should draw all the electron for given element.
In the example of sodium and chlorine:
Sodium : 1s2, 2s2 2p6, 3s1
Chlorine: 1s2, 2s2, 2p6, 3s2 3p5
All the electron on the 1 and 2 levels will not be used to this representation because they will not leave the valence band. Only the electrons in the 3 level will interact in this example.
Remember that the sodium will lose an electron and become an cation. This happens because all the element will look for a stable form with the last band having 8 electron.
The chlorine will receive an electron, so the last band will have 8 electron.
