Calcium
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Calcium is a chemical element; it has symbol Ca and atomic number 20. As an alkaline earth metal, calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air. Its physical an
Calcium unter Argon Schutzgasatmosphäre
Calcium crystals stored in mineral oil
One of the 'Ain Ghazal Statues, made from lime plaster
Travertine terraces in Pamukkale, Turkey
Scandium
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Scandium is a chemical element; it has symbol Sc and atomic number 21. It is a silvery-white metallic element found in the d-block of the periodic table. Usually, it is classified as a rare-earth elem
Calcium
…light element, 48Ca is very stable because it is a doubly magic nucleus, with 20 protons and 28 neutrons arranged in closed shells. Its beta decay to 48Sc is very hindered by the gross mismatch of nuclear spin: 48Ca has zero nuclear spin, being even–even, while 48Sc has spin 6+, so the decay is forbidden…
Scandium sublimed dendritic and 1cm 3 cube
Parts of the MiG-29 are made from Al-Sc alloy.