Chromium

Koushik 26/06/2026 19:58:08 Updated 26/06/2026 19:58:08

Property	Value
Atomic Number	24
Element	Chromium
Symbol	Cr
Atomic Mass	51.996 u
Number of Neutrons	28 (most common isotope, Chromium-52)
Number of Protons	24
Number of Electrons	24
Period	4
Group	6
Phase	Solid
Radioactive	No
Natural	Yes
Metal	Yes
Nonmetal	No
Metalloid	No
Type	Transition Metal
Atomic Radius	166 pm
Electronegativity	1.66 (Pauling scale)
First Ionization Energy	6.767 eV
Density	7.19 g/cm³
Melting Point	1907 °C
Boiling Point	2671 °C
Number of Isotopes	4 stable (Chromium-50, Cr-52, Cr-53, Cr-54)
Discoverer	Nicolas-Louis Vauquelin
Year	1797
Specific Heat	0.449 J/g·K
Number of Shells	4
Number of Valence Electrons	6