The atom can involve 3 electrons in bonding.
There are 3 valence electrons in the outermost shell, they participate in the bonding. After the removal of those valence electrons, the atom attains a noble stable electronic configuration and it requires a very high amount of energy to remove the electron.
The outer electrons of atoms can form bonds in one of three ways:
As an example, visualize a sodium atom, which has one electron on its outermost orbit, approaching a chlorine atom, which has seven. The chlorine atom can be thought of as lacking one electron because these atoms need eight electrons to fill their outermost shell. A sodium chloride system is created at a lower total energy level when the sodium atom offers its lone valence electron to close the hole in the chlorine shell.
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