A molecule consists of two or more atoms, which are held together by chemical bonds.A water molecule is made up of two atoms of hydrogen (H) and one atom of oxygen (O). Thus, the chemical formula of water is H2O. Elements also frequently occur in molecular forms. For example, two atoms of chlorine, oxygen, and nitrogen combine to form CL2, O2, and N2, respectively. There are complicated molecules as well, such as those of plastic.
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