Ionic Compounds all form in a similar way
Dot and cross diagrams show what happens to the electrons when ionic bonding happens
Sodium Chloride (NaCl)
The sodium atom gives up its outer electron, becoming an Na+ ion. The chlorine atom picks up the electron, becoming a Cl- ion.
The magnesium gives up its two outer electrons, becoming an Mg2+ ion. The oxygen atom picks up the electrons, becoming an O2- ion.
Sodium Oxide (Na2O)
Two sodium atoms give up their outer electrons, becoming two Na+ ions. The oxygen atom picks up the two electrons, becoming an 02- ion.
Calcium Chloride (CaCl2)
The calcium atom gives up its two outer electrons…