Chromium (Cr). Diagram of the nuclear composition and electron configuration of an atom of chromium-52 (atomic number: 24), this element's most common
Chromium (Cr). Diagram of the nuclear composition and electron configuration of an atom of chromium-52 (atomic number: 24), this element's most common isotope. The nucleus consists of 24 protons (red) and 28 neutrons (blue). 24 electrons (green) bind to the nucleus, successively occupying available electron shells (rings). Chromium is a transition metal in group 6, period 4, and the d-block of the periodic table. It has a melting point of 1907 degrees Celsius. The trends across the transition metals are due to electrons filling an inner d-subshell (here, within the 3rd ring), shielding the outer electrons from the increasing nuclear charge.
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