1. The smallest particle that makes up a substance is called an atomcalciumcarboncompoundcopperelementFeImetalsmoleculeNNeoxygensodiumsteelsulphur.

2. Atoms can combine to make a bigger particle called a atomcalciumcarboncompoundcopperelementFeImetalsmoleculeNNeoxygensodiumsteelsulphur.

3. Each different type of atom is called an atomcalciumcarboncompoundcopperelementFeImetalsmoleculeNNeoxygensodiumsteelsulphur.

4a. Each element has its own chemical symbol eg Cu for atomcalciumcarboncompoundcopperelementFeImetalsmoleculeNNeoxygensodiumsteelsulphur, C for atomcalciumcarboncompoundcopperelementFeImetalsmoleculeNNeoxygensodiumsteelsulphur, Na for atomcalciumcarboncompoundcopperelementFeImetalsmoleculeNNeoxygensodiumsteelsulphur, S for atomcalciumcarboncompoundcopperelementFeImetalsmoleculeNNeoxygensodiumsteelsulphur and Ca for atomcalciumcarboncompoundcopperelementFeImetalsmoleculeNNeoxygensodiumsteelsulphur.

4b. Iron has the symbol atomcalciumcarboncompoundcopperelementFeImetalsmoleculeNNeoxygensodiumsteelsulphur, iodine's symbol is atomcalciumcarboncompoundcopperelementFeImetalsmoleculeNNeoxygensodiumsteelsulphur, nitrogen is atomcalciumcarboncompoundcopperelementFeImetalsmoleculeNNeoxygensodiumsteelsulphur and neon is atomcalciumcarboncompoundcopperelementFeImetalsmoleculeNNeoxygensodiumsteelsulphur.

5. Far more elements are strong atomcalciumcarboncompoundcopperelementFeImetalsmoleculeNNeoxygensodiumsteelsulphur like iron used in making atomcalciumcarboncompoundcopperelementFeImetalsmoleculeNNeoxygensodiumsteelsulphur, but there are a smaller number of non-metals, which are usually gases like atomcalciumcarboncompoundcopperelementFeImetalsmoleculeNNeoxygensodiumsteelsulphur.

6. Atoms of different elements can combine together to form a new substance called a atomcalciumcarboncompoundcopperelementFeImetalsmoleculeNNeoxygensodiumsteelsulphur.