Zirconium (Zr) - Element 40 | Properties & Electron Configuration
What is Zirconium?
Zirconium (Zr) is element 40, a transition metal in period 5, group 4. Its electron configuration is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d² 5s².
| Atomic Number | 40 |
| Symbol | Zr |
| Atomic Mass | 91.224 u |
| Category | Transition Metal |
| Period | 5 |
| Group | 4 |
| Block | d |
| Electron Configuration | 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d² 5s² |
| Short Config | [Kr] 4d² 5s² |
| Electronegativity | 1.33 |
| Atomic Radius | 155 pm |
| Ionization Energy | 640 kJ/mol |
| Electron Affinity | 41 kJ/mol |
| Phase (STP) | Solid |
Electron Configuration
The full electron configuration of Zirconium is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d² 5s². In noble gas shorthand, this is written as [Kr] 4d² 5s².
Zirconium is a d-block element in group 4, period 5.
Periodic Trends
Electronegativity: Zirconium has a Pauling electronegativity of 1.33. Within group 4, electronegativity generally decreases down the group.
Atomic Radius: 155 pm. Across period 5, atomic radius generally decreases left to right as nuclear charge increases.
Ionization Energy: 640 kJ/mol. Ionization energy generally increases across a period and decreases down a group.
View all 118 elements with trend overlays for electronegativity, atomic radius, ionization energy, and electron affinity.
Explore Zirconium on the Interactive Periodic TableRelated Topics
Titanium (Ti)
Properties of Titanium - same group as Zirconium
Hafnium (Hf)
Properties of Hafnium - same group as Zirconium
Rutherfordium (Rf)
Properties of Rutherfordium - same group as Zirconium
Rubidium (Rb)
Properties of Rubidium - same period as Zirconium
Strontium (Sr)
Properties of Strontium - same period as Zirconium
Yttrium (Y)
Properties of Yttrium - same period as Zirconium