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Metalloid
Metalloid
A class of elements intermediate in properties between metals and non-metals.
Metalloids are also called semi-metals or semi-conductors. Examples of metalloids are silicon, germanium and antimony.
Mineral
A solid substance made of just one element or chemical compound.
Calcite is a mineral because it consists only of calcium carbonate; halite is a mineral because it contains only sodium chloride; quartz is a mineral because it consists only of silicon dioxide.
Molecule
A group of two or more atoms held together by chemical bonds.
Molybdenum (Mo)
Element 42 on the periodic table. A rare, silver-grey metal belonging
to the transition metals.
It was named from the Greek word for ‘lead’ because it looks
like lead. It is used as an alloy to strengthen and increase the melting point of steel. It also improves corrosion resistance.
N
Neodymium (Nd)
Element 60 on the periodic table. A silvery-white rare-earth metal and one of the lanthanides.
It is used to colour glass. Neodymium glass can replace a ruby inside a laser.
Neon (Ne)
Element 10 on the periodic table. A colourless, odourless and tasteless inert gas of group 8 (the noble gases).
Neon was discovered (1898) by the British chemists Sir William
 Neon – All lights in discharge tubes
are generally called ‘neon’; however, neon only emits a reddish-orange glow. Each of the noble gases produces a different ‘neon’ colour. For example, helium produces a yellow ‘neon’ light when an electric current flows through it.
Ramsay and Morris W. Travers. Neon forms no stable compounds. Its main use is in ‘neon’ signs and fluorescent bulbs.
Neptunium (Np)
Element 93 on the periodic table. A silver-coloured radioactive element of the actinide series.
In 1940 it became the first transuranium element to be artificially produced.
Neutron
A particle inside the nucleus of an atom that is neutral (has no charge).
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