Scandium. By: Jeremy Enneking. Discovered. 1878 Lars Nilson. Atom. Atomic number 21 21 protons 21 electrons 24 neutrons Atomic mass 45. Physical Properties . Silver-white Solid Soft Metallic Density: 2.2989 g/cm³ Melting point: 2802°F Boiling point: 5129.6°F
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By: Jeremy Enneking