Transition metal

Zirconium

Zirconium (Zr) has atomic number 40. PubChem classifies it as transition metal.

Atomic number

40

Symbol

Zr

Atomic weight (source value)

91.22

Electron configuration

[Kr]5s2 4d2

Standard state

Solid

Electronegativity (Pauling)

1.33

Melting point (K)

2128

Boiling point (K)

4682

Density (g/cm³)

6.52

Oxidation states

+4

Understanding this entry

Atomic number is the number of protons in the nucleus. Properties are reference values and may depend on conditions and measurement conventions. An atomic weight is not the mass of every isotope. For elements without a standard atomic weight, a source may report an isotope mass number. Blank source values are shown as unavailable rather than estimated.

Further reading and reference: NIH PubChem source dataset ↗. Values and educational summaries are not a substitute for specialised advice.