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Europium ignites in air at about 150 to 180°C. Europium is about as hard as lead and is quite ductile. It is the most reactive of the rare earth metals, quickly oxidising in air

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Pure metallic radium is brilliant white when freshly prepared, but blackens on exposure to air, probably due to formation of the nitride. It exhibits luminescence, as do its salts; it decomposes in water and is somewhat more volatile than barium.

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Hydrogen is the lightest element. It is by far the most abundant element in the universe and makes up about about 90% of the universe by weight.

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Pure aluminium is a silvery-white metal with many desirable characteristics. It is light, nontoxic (as the metal), nonmagnetic and nonsparking. It is somewhat decorative.

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Plutonium was the second transuranium element of the actinide series to be discovered. By far of greatest importance is the isotope ²³⁹Pu, which has a half-life of more than 20000 years.

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The most important uranium ore is uranite, usually called pitchblende.