Zirconium commonly forms Zr4+ in introductory ionic compounds.
| Element | Zirconium |
|---|---|
| Symbol | Zr |
| Atomic number | 40 |
| Common ionic charge | +4 |
| Common ions | Zr4+ |
Images are used as visual references; charge rules still depend on the compound.
Zirconium is [Kr]4d2 5s2. Surrendering all four outer electrons reaches the krypton core, and the +4 state is so comfortable that intermediate states barely register. Its oxide's toughness and inertness follow directly: Zr4+ holds oxide ions in a dense, stubborn lattice.
This is a classroom reference range, not an exhaustive list of all oxidation states.
Writing zirconium oxide as ZrO to match 'one metal, one oxygen' intuition. Zr4+ demands two O2-: ZrO2. The formula is the same logic as TiO2, its lighter group-mate.
The cladding is neutral metal chosen for barely absorbing neutrons. Its surface carries a thin ZrO2 film (Zr4+) that resists hot water corrosion — the same +4 oxide that makes dental zirconia durable.
Zirconium chloride
Zr4+ balances chloride ions.
Zirconium oxide
Zirconium can form oxides where total positive and negative charge balances.
No: cubic zirconia is synthetic ZrO2; zircon is natural ZrSiO4. Both put zirconium at +4 — the charge is identical, the crystal and the price are not.
Aluminum-zirconium complexes (Zr at +4) hydrolyze in sweat ducts to form a temporary gel plug. The high charge is the point: 4+ ions crosslink and precipitate readily.
Zr4+ has no d electrons remaining (d0), so no d-d light absorption occurs — ZrO2 is bright white, and zirconium solutions are colorless, just like d0 Ti4+ and Sc3+.
Combine positive and negative ions so the total charge is zero — or let the ionic compound calculator do the crossing for you. The full chart lives on the periodic table with charges.
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