When bond are formed the valence electrons affects the type and number of bonds it can form.
Electrons play a major role in all chemical bonds. There is one type of bonding that is called electrovalent bonding (ionic), where an electron from one atom is transferred to another atom. You wind up creating two or ore ions as one atom loses an electron and one gains one.
The number of valence electron an element has affects the type and number of bonds it can formed because if it has 7 valence electrons it can't form double or triple covalent bonds because it would have more than 8 valence electrons which isn't possible and if it has 1 valence electron it can't lose.
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