40Zr91.224
Zirconium
Transition metal · element 40 · group 4, period 5
Quick facts
| Symbol | Zr |
|---|---|
| Atomic number | 40 |
| Relative atomic mass | 91.224 |
| Category | Transition metal |
| Position | group 4, period 5 |
| State at 20 °C | Solid |
| Melting point | 1,855 °C |
| Boiling point | 4,409 °C |
| Density | 6.52 g/cm³ |
| Electronegativity | 1.33 |
| Electron configuration | [Kr] 4d2 5s2 |
About Zirconium
Zirconium has the symbol Zr and atomic number 40, which means every zirconium atom has 40 protons in its nucleus and, in a neutral atom, 40 electrons. At room temperature it is a solid.
Transition metals sit in the middle block of the periodic table. They are usually hard, dense and strong, often form coloured compounds, can have more than one ion charge, and many are useful catalysts.
It melts at 1,855 °C and boils at 4,409 °C.
Explore it
See where zirconium sits, and drag the temperature slider to watch it melt and boil, on the interactive periodic table. Practise with quizzes on OmniEx.