Comparison of Fermium and Nobelium

Attribute	Nobelium ×	Fermium ×
Atomic mass (u)	259.101	257.09511
Standard state	Solid	Solid
Oxidation states	+2 +3	+3
Electron configuration	[Rn]7s²5f¹⁴	[Rn]5f¹²7s²
Ionization energy (eV)	6.65	6.5
Electronegativity (pauling scale)	1.3	1.3
Melting point (K)	1100	1800
Atomic number	102	100
Group name	Actinide	Actinide
Discovered (year)	1957	1952
Symbol	No	Fm