Comparison of Boron and Zirconium

Attribute	Boron ×	Zirconium ×
Atomic mass (u)	10.81	91.22
Standard state	Solid	Solid
Oxidation states	+3	+4
Electron configuration	[He]2s²2p¹	[Kr]5s²4d²
Atomic radius (van der waals) (pm)	192	186
Electronegativity (pauling scale)	2.04	1.33
Electron affinity (eV)	0.277	0.426
Ionization energy (eV)	8.298	6.634
Boiling point (K)	4273	4682
Melting point (K)	2348	2128
Density (g/cm³)	2.37	6.52
Atomic number	5	40
Group name	Metalloid	Transition metal
Discovered (year)	1808	1789
Symbol	B	Zr