because the repulsive force overcome the attrative force (for nuclei)
A covalent bond exists between two elements that share electrons. In a covalent bond, the shared electrons are attracted to the nuclei of both atoms, creating a strong bond between the two atoms.
covalent bond
Covalent bonding exists in the Cl2 molecule. Each chlorine atom shares one electron with the other to form a single covalent bond between them.
A covalent bond typically exists between nitrogen and phosphorus. Both elements are nonmetals and commonly form covalent compounds due to their electronegativity.
Nitrous dioxide has a covalent bond, specifically a double bond, between nitrogen and one of the oxygen atoms. The other oxygen atom is bonded to nitrogen through a single covalent bond.
A covalent bond exists between an atom of carbon and an atom of fluorine. In this type of bond, the atoms share a pair of electrons to achieve a stable electron configuration.
In any compound, if there exists a bond between sodium and oxygen, it is ionic.
When the difference in electronegativity between atoms is 0.9, a polar covalent bond exists.
A covalent bond exists between nitrogen and hydrogen in a molecule such as ammonia (NH3). This bond involves the sharing of electrons between the atoms.
In a nitrogen molecule there are three covalent bonds (called a triple bond).
Helium does not typically form bonds with other elements. It exists as a noble gas with a stable electron configuration, so it does not form ionic or covalent bonds.
Polar covalent