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Helium
Energy
Germanium (Ge)
Deuterium
Discovered by J. C. G. de Marignac and Paul-Émile Lecoq de Boisbaudran in 1880, gadolinium was named for the Finnish chemist Johan Gadolin. It is used in electronic components.
Gallium (Ga)
Element 31 on the periodic table. A rare silvery-white metal of the boron group, which is group 3.
It has a melting point just above room temperature. Gallium was discovered by Paul-Émile Lecoq de Boisbaudran in 1875 as an impurity in zinc blende (sulphide). Some gallium compounds emit light when an electric current passes through them.
Germanium (Ge)
Element 32 on the periodic table. A rare, brittle, silvery-grey metalloid in group 4 (the carbon group). It was discovered by Clemens Winkler, a German chemist, in 1886.
Germanium is important as a semi-conductor and is used in
silicon chips as well as some high-quality lenses.
Tritium
 Fusion – The deuterium-tritium fusion reaction. Deuterium and tritium are isotopes of hydrogen.
Francium (Fr)
Element 87 on the periodic table. The heaviest alkali metal (a group 1 element).
It is a radioactive metal that does not occur naturally. Marguerite Perey discovered it in 1939.
Neutron
Fusion
The combining of atoms to form a heavier atom.
G
Gadolinium (Gd)
Element 64 on the periodic table. A rare silvery-white and easily bent rare-earth metal and one of the lanthanides.
 Germanium
– A germanium diode.
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