Atomic Symbol: Cr.
Atomic Number: 24.
Atomic Weight: 51.9961.
Isotopes and Abundances: 50Cr 4.35%, 52Cr 83.79%, 53Cr 9.50%, 54Cr 2.36%.
1 Atm Melting Point: 2130 ± 20 K.
1 Atm Boiling Point: 2945.
Common Valences: 2, 3, 4, 6.
Ionic Radii: (+II) 84, (+III) 64, (+IV) 56, (+VI) 44 ppm.
Pauling Electronegativity: 1.66.
First Ionization Potential: 6.76 eV.
Chondritic (CI) Abundance: 2660 ppm.
Silicate Earth Abundance: 2625 ppm.
Crustal Abundance: ~100 ppm.
Seawater Abundance: 0.2 ppb.
Core Abundance: 0.90%.
Chromium (Emsley 1991, 2001; Anthoni 2006; Anders and Grevesse 1989; McDonough 2005) is a lustrous, brittle, hard, and very corrosion-resistant metal. It has a silver-gray color with a blue tinge and it can be highly polished. It does not tarnish in air, but when heated it burns forming the green chromic oxide. Chromium is unstable in oxygen as it immediately reacts to form a thin oxide layer that is impermeable to oxygen and protects the metal below. Chromium...
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