Acovalent bond is a chemical bond in which atoms share an isotope. a nucleus. molecules. electrons.

The answer is electrons. 

A covalent bond is a type of chemical bond where atoms share electrons.  Covalent bonds are also referred to as molecular bonds because they form molecules when bonded.

This type of bond occurs between non-metals. An example of a compound or a molecule that is formed through covalent bonding is water. It is a combination of two hydrogen atoms bonded with an oxygen atom. H₂O 

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