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(N/A)       Atom    Molecule        $(i)$ An atom is the smallest particle of an element that takes part in a chemical reaction.    $(i)$ $A$ molecule

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(N/A)       Atom    Molecule        $(i)$ An atom is the smallest particle of an element that takes part in a chemical reaction.    $(i)$ $A$ molecule is the smallest particle of an element or a compound that is capable of independent existence.        $(ii)$ An atom is usually not stable by itself.    $(ii)$ $A$ molecule is usually stable by itself.        $(iii)$ Similar atoms can combine in varying numbers to form different molecules with different properties. e.g.,$O_2$ and $O_3$.    $(iii)$ When similar molecules combine in any number,the nature of the substance remains the same. e.g.,$5$ water molecules combined with $50$ water molecules still represent water.

Give three differences between an atom and a molecule.

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Atom	Molecule
$(i)$ An atom is the smallest particle of an element that takes part in a chemical reaction.	$(i)$ $A$ molecule is the smallest particle of an element or a compound that is capable of independent existence.
$(ii)$ An atom is usually not stable by itself.	$(ii)$ $A$ molecule is usually stable by itself.
$(iii)$ Similar atoms can combine in varying numbers to form different molecules with different properties. e.g.,$O_2$ and $O_3$.	$(iii)$ When similar molecules combine in any number,the nature of the substance remains the same. e.g.,$5$ water molecules combined with $50$ water molecules still represent water.