Manganese

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

Property	Value
Atomic Number	25
Element	Manganese
Symbol	Mn
Atomic Mass	54.938 u
Number of Neutrons	30 (most common isotope, Manganese-55)
Number of Protons	25
Number of Electrons	25
Period	4
Group	7
Phase	Solid
Radioactive	No
Natural	Yes
Metal	Yes
Nonmetal	No
Metalloid	No
Type	Transition Metal
Atomic Radius	161 pm
Electronegativity	1.55 (Pauling scale)
First Ionization Energy	7.434 eV
Density	7.21 g/cm³
Melting Point	1246 °C
Boiling Point	2061 °C
Number of Isotopes	1 stable (Manganese-55)
Discoverer	Johan Gottlieb Gahn
Year	1774
Specific Heat	0.479 J/g·K
Number of Shells	4
Number of Valence Electrons	7