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Electron configuration of Hafnium (Hf)

Read the Hafnium electron configuration, noble-gas shorthand, valence shell, orbital filling logic, and the mistakes to avoid when writing Hf.

Guide: Guía práctica Read: 5 min Updated: 2026-07-07
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Element guide

Electron configuration of Hafnium (Hf)

The electron configuration of Hafnium is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d2 6s2. In shorthand form it is written as [Xe] 4f14 5d2 6s2.

Use this page to connect the notation with atomic number 72, the d-block, and the valence pattern 5d2 6s2.

How to write the configuration

Configuration at a glance

Hafnium has atomic number 72, so a neutral atom has 72 electrons. The configuration is lengthy because Hf lies after the lanthanide series, so the 4f subshell (14 electrons) is completely filled.

The shorthand [Xe] 4f14 5d2 6s2 replaces the filled inner core with xenon. The 4f14 is part of the core notation but is sometimes written explicitly before 5d2 6s2.

Step-by-step filling

After the xenon core (54 electrons), 18 more electrons need placement. The 6s subshell fills first (2 electrons), then the 4f subshell fills with 14 electrons (the entire lanthanide series), and finally 2 electrons go into the 5d subshell.

Step-by-step filling walkthrough: 1. Start with atomic number 72. 2. Fill through xenon: 54 electrons in 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6. 3. Fill 6s2 (56 electrons total). 4. Fill 4f14 (70 electrons total — the lanthanide series). 5. Place 2 electrons in 5d (72 electrons total). 6. These two 5d electrons occupy different d orbitals (Hund's rule), giving Hf two unpaired electrons.

The lanthanide contraction effect

Hafnium's atomic radius is nearly identical to Zirconium's (its lighter congener in group 4), even though Hf has 32 more electrons. This is the lanthanide contraction: the 4f electrons shield poorly, increasing effective nuclear charge and pulling the outer orbitals inward.

As a result, Hf and Zr have almost identical chemical properties and are very difficult to separate.

Common mistakes

The first mistake is forgetting to include the 4f14 subshell after 6s2. The 4f orbitals fill between 6s and 5d. The second mistake is miscounting: the full tally is 2+2+6+2+6+10+2+6+10+14+2+6+2+2 = 72.

A third common error is writing the configuration in the wrong order. Some references order by principal quantum number (4f before 5d) while others use filling order (5d before 4f).

Hafnium reference table

Item Value
Atomic number 72
Full configuration 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d2 6s2
Noble-gas notation [Xe] 4f14 5d2 6s2
Valence clue 5d2 6s2
Block d-block

Use the table as a learning reference, then verify advanced oxidation-state questions with your course material.

Before you submit an answer

  • The superscripts add up to 72 for a neutral Hafnium atom.
  • The notation follows the filling order used in your course.
  • The last occupied subshell matches the periodic-table block.
  • Any transition-metal or actinide exception is checked against a reference.
  • The shorthand core is a noble gas, not a random previous element.

Common questions

What is the electron configuration of Hafnium?

The neutral Hafnium atom is written as 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d2 6s2. The shorthand form is [Xe] 4f14 5d2 6s2.

How many valence electrons does Hafnium have?

Start from the outer-shell clue 5d2 6s2. For transition metals, inspect both s and d electrons carefully. Hafnium has 4 valence electrons.

Should I memorize this configuration?

Memorize the filling pattern first. Hafnium's configuration is long but systematic: xenon core, then 6s2, 4f14, 5d2. Understanding the 4f filling sequence is more important than memorizing.

Why are Hafnium and Zirconium so similar?

The lanthanide contraction causes Hf and Zr to have almost identical atomic radii. Since electron configuration and size determine chemical properties, Hf and Zr behave nearly identically in compounds.

Practice nearby concepts

Elements hub Start from the periodic-table families and move to individual configurations. Electron configuration calculator Check a classroom configuration and see the shell-by-shell reading. Orbital diagram guide Translate a configuration into boxes, arrows, and paired electrons. Valence electrons guide Use the outer shell to predict bonding patterns and common ions.

Study notes and practice checks

From answer to understanding

Hafnium is the period 6 member of group 4, sitting directly below Zirconium. Its 5d2 6s2 configuration matches the pattern of Ti (3d2 4s2) and Zr (4d2 5s2), confirming that group 4 consistently has d2 s2 across three periods.

Practice comparison

Compare Hafnium (Hf) with Titanium (Ti) and Zirconium (Zr). Ti: [Ar] 3d2 4s2, Zr: [Kr] 4d2 5s2, Hf: [Xe] 4f14 5d2 6s2. The d2 s2 pattern persists across all three periods, though Hf's core includes the filled 4f14 subshell.

Teacher and self-study notes

Hafnium is important in nuclear control rods because of its high neutron absorption cross-section. Its chemical similarity to Zr, combined with different nuclear properties, makes the Hf-Zr separation a critical industrial process.

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Elena Marquez

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Elena explains electron configurations, orbital diagrams, and periodic trends for learners who need clear steps before memorization. Her guides focus on counting, notation, and common classroom mistakes.

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Elements

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Electron configuration of Yttrium (Y) Read the Yttrium electron configuration, noble-gas shorthand, valence shell, orbital filling logic, and the mistakes to avoid when writing Y. Electron configuration of Zinc (Zn) Read the Zinc electron configuration, noble-gas shorthand, valence shell, orbital filling logic, and the mistakes to avoid when writing Zn. Electron configuration of Zirconium (Zr) Read the Zirconium electron configuration, noble-gas shorthand, valence shell, orbital filling logic, and the mistakes to avoid when writing Zr.

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