17.11.13
Aluminium has one type of atom.
Pure metals have one type of atom.
Bronze and brass are non-ferrous alloys.
Steel and invar are examples of ferrous alloys.
Some alloys are ferrous and some are non-ferrous.
Oxygen has only one type of atom, so it is an element.
Aluminium is a pure metal: it has only aluminium atoms.
Oxygen and hydrogen are elements, so they have one type of atom.
Pure metals are chemical elements but most industrial metalls are alloys.
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A¹B
Elements have only one type of atom whereas compounds have more than one type.
A\B
Iron is one of the substances in steel, so steel is a ferrous metal.
A=B
Copper and zinc are pure metals: they have only one type of atom.
Copper and zinc are pure metals; i.e. they have only one type of atom.
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