Atoms combine because they tend to complete their octets or duplets in the case of H, Li and Be. Another reason for the combination of atoms is the lowering of enthalpy that takes place when atoms combine together.
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Can a bond be formed without the formation of a sigma bond?
No.
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What are valence electrons?
Valence electrons are electrons which present in the outermost orbit.
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What type of bond is possible between a filled orbital and an empty orbital?