Compound made of two elements (e.g., water), Molecule that has three elements, Monoatomic element (e.g., helium), Substance in the solid state that is made up of atoms (e.g., metals), Element that exists as a molecule (e.g., hydrogen gas), Mixture of an element and a compound, Mixture of two compounds, Mixture of neon and oxygen gas,

Challenge: (i) elements, compounds, mixtures and (ii) atoms and molecules

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