Comparison of Einsteinium and Nobelium

Attribute	Nobelium ×	Einsteinium ×
Standard state	Solid	Solid
Electron configuration	[Rn]7s²5f¹⁴	[Rn]7s²5f¹¹
Atomic mass (u)	259.101	252.083
Electronegativity (pauling scale)	1.3	1.3
Oxidation states	+2 +3	+3
Ionization energy (eV)	6.65	6.42
Atomic radius (van der waals) (pm)	-	245
Melting point (K)	1100	1133
Atomic number	102	99
Group name	Actinide	Actinide
Symbol	No	Es
Discovered (year)	1957	1952