Atoms often bond with eachother to form a chemical unit called a molecule. A molecule can contain atoms of the same kind or they can be different. When the atoms are different a compound is present. There are two types of bonds that join atoms.
The ionic bond is when atoms give up or take on and electron(s) in order to achieve a stable outer shell.
The covalent bond is a chemical bond in which atoms share one pair of electrons.
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