Why do covalent bonds occur?
Because atoms want to achieve a stable octet structure like that of noble gases.

However, bonding can be easily occurred between a metal and a non-metal, since a metal easily loses a electron and a non-metal is electronegative so it attracts electrons to itself more easily.
However, what happens when a non-metal wants to achieve a stable octet structure like that of a noble gas?
Ans: It SHARES electrons. It is also known as covalent bonding. Each electron contributes electrons to be shared.
A preview into covalent bonding and why they occur
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