COVALENT BONDS.

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Presentation transcript:

COVALENT BONDS

Covalent bonds are usually formed between atoms of nonmetals. The force that holds atoms together in a covalent bond is the attraction of each atom’s nucleus for the shared pair of electrons. A molecule is a neutral group of atoms joined by covalent bonds.

If the atom shares one pair of electrons they make a single bond. If the atom shares two pairs of electrons they make a double bond. If the atom shares three pairs of electrons they make a triple bond.

Molecular Compound- is a compound composed of molecules, that are covalently bonded. Compared to ionic compounds, molecular compounds generally have lower melting points and boiling points. And, unlike ionic compounds, molecular compounds do not conduct electric current when melted or dissolved in water.

Unequal sharing of electrons- atoms of some elements pull more strongly than do atoms of other elements. Unequal sharing of electrons causes the bonded atoms to have slight electric charges. Polar bond is a covalent bond in which electrons are shared unequally. Nonpolar bond is a covalent bond in which electrons are shared equally.