Biology Chapter 2.2 Molecules and Compounds

Hydrogen bond

weak bond that arises between a slightly positive hydrogen atom of one molecule and a slightly negative atom of another molecule or between parts of the same molecule

Molecule

Union of two or more atoms of the same element; also, the smallest part of a compound that retains the properties of the compound.

Compound

Substance having two or more different elements in a fixed ratio

Ion

Charged particles that carries a negative or positive charge

Ionic bonds

Chemical bond in which ions are attracted to one another by opposite charges.

Covalent bonding

Chemical bond in which atoms share one pair of electrons

Nonpolar covalent bond

bond in which the sharing of electrons between atoms is fairly equal

Electronegativity

The ability of an atom to attract electrons toward itself in a chemical bond.

Polar covalent bond

bond in which the sharing of electrons between atoms is unequal