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Atomic Structure

Covalent Bonding.

When non-metals react with non-metals they share electrons
and form a covalent bond. Covalent means sharing.
If you do not know whether an element is a metal
or a non-metal, see the periodic table.

One pair of shared electrons form a single covalent bond.
Two pairs of shared electrons form a double covalent bond.
Three pairs of shared electrons form a triple covalent bond.

Only covalent compounds are called molecules.
If the compound is ionic it is not called a molecule.

Covalent compounds containing a small number of atoms
are called simple molecules.
Simple means that only a small number of atoms are present.
If a huge number of atoms are present it would be called a giant molecule.

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