When elements react, their atoms join with other atoms to form compounds. This involves giving, sharing and taking electrons. The atoms are held together to make the compound.
Transfer of electrons - ionic bond - metal + non-metal
Sharing of electrons - covalent bond - two non-metals
Atoms and symbols are used to represent and explain what is happening to the substances in chemical reactions.
The formula of a compound shows the number and type of atoms that are joined together to make the compound.
No atoms are lost or made during a chemical reaction so the mass of the products equals the mass of the reactants and we can write balanced equations showing the atoms involved.
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