· When an atom has a full outer shell, it is stable and unreactive.
· A noble gas structure is a structure with a full outer shell (and so is unreactive)
· In Ionic Boning, the atoms involved lose or gain electrons so that they have a noble gas structure. For example, if sodium, 2, 8, 1, loses one electron it is left with the stable unreactive structure of neon 2, 8. However, because we have taken away one electron, the nucleus of the atom contains one more proton than there are electrons. We call this positively charged. The extra proton has now become a positively charged particle, and so is called a sodium ion. We write the formula of that sodium ion as Na+. The electronic structure of the Na+ ion is [2, 8]+.
· Similarly, some atoms need to gain electrons to achieve a full and stable outer shell. Chlorine, for example, has the electronic structure 2, 8, 7. By gaining a single electron, it gets the stable electronic structure of argon (2, 8,…