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All 118 elements, one card each. Pull any of them from the table: turn the sample in your hand, then flip to its atom and change the isotope. The rarity on each card is how much of it there is in the Earth's crust.
Soft, silvery and so eager to lose their one outer electron that they fizz in water.
Two outer electrons, a little calmer than the alkalis; the stuff of bones, shells and fireworks.
The broad middle of the table: hard, shiny, often coloured, the metals of tools and coins.
Softer metals with low melting points, from aluminium foil to tin and lead.
One electron short of a full shell and hungry for it; they make salts with metals.
Full outer shells, so they barely react. Pass a current through them and they glow.
The rare earths: strong magnets, phone screens and lasers.
All radioactive. Uranium and thorium occur in nature; most of the rest are made in reactors.
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The element that lay hidden. Its name comes from the Greek lanthanein, 'to lie hidden', because it had been hiding inside cerium minerals. Lanthanum-rich glass bends light strongly, which is why it goes into quality camera lenses.