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In covalent combinations, atoms share electrons to form a stable bond. The types of covalent combinations are:
1. Single bond: In a single bond, one pair of electrons is shared between two atoms.
2. Double bond: In a double bond, two pairs of electrons are shared between two atoms.
3. Triple bond: In a triple bond, three pairs of electrons are shared between two atoms.
4. Coordinate bond: In a coordinate bond, one atom donates both electrons to form the bond, while the other atom accepts the electrons. Coordinate bonds are also known as dative bonds.