Comparison of Manganese and Americium

Attribute	Americium ×	Manganese ×
Standard state	Solid	Solid
Electron configuration	[Rn]7s²5f⁷	[Ar]4s²3d⁵
Atomic mass (u)	243.06138	54.93804
Electronegativity (pauling scale)	1.3	1.55
Oxidation states	+3 +4 +5 +6	+2 +3 +4 +7
Ionization energy (eV)	5.993	7.434
Atomic radius (van der waals) (pm)	244	197
Boiling point (K)	2284	2334
Melting point (K)	1449	1519
Density (g/cm³)	13.69	7.3
Atomic number	95	25
Group name	Actinide	Transition metal
Discovered (year)	1944	1774
Symbol	Am	Mn