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Electron configuration of Gold (Au)

Read the Gold electron configuration, noble-gas shorthand, valence shell, orbital filling logic, and the mistakes to avoid when writing Au. Includes the Au group 11 exception similar to Cu and Ag.

Guide: Guía práctica Read: 7 min Updated: 2026-06-19
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Element guide

Electron configuration of Gold (Au)

The electron configuration of Gold is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s1. In shorthand form it is written as [Xe] 4f14 5d10 6s1.

Use this page to connect the notation with atomic number 79, the d-block, and the valence pattern 6s1.

How to write the configuration

Configuration at a glance

Gold has atomic number 79, so a neutral atom has 79 electrons. The configuration 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s1 is a compact record of where those electrons sit by subshell. The number before each letter is the principal energy level, the letter names the subshell, and the superscript tells you how many electrons are assigned there.

The shorthand [Xe] 4f14 5d10 6s1 replaces the filled inner core with the previous noble gas. This notation keeps attention on the electrons that usually explain bonding, ions, and periodic trends.

The Gold exception you need to know

Gold belongs to group 11, the same family as Copper (Cu) and Silver (Ag). All three elements share a similar electron configuration exception: instead of the expected ns2 (n−1)d9 pattern, they adopt ns1 (n−1)d10. For gold, based on the Aufbau principle, you would expect [Xe] 4f14 5d9 6s2 (6s fills before 5d). However, the measured ground state of gold is [Xe] 4f14 5d10 6s1. A completely filled 5d subshell (5d10) is more stable than a 6s2 5d9 arrangement because the exchange energy gained from having all five d orbitals fully occupied outweighs the energy cost of a half-empty 6s orbital. This stabilization is even stronger in gold than in copper or silver due to relativistic effects.

For Gold, apply the exception: after filling through 5d9 6s2, shift one 6s electron to 5d to get 5d10 6s1.

Step-by-step filling walkthrough: 1. Start with atomic number 79. 2. Follow the Aufbau sequence: fill through 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p in order. 3. Keep a running total of electrons after each subshell. 4. Write the noble-gas shorthand by replacing the filled core with [Xe] (54 electrons). 5. Verify: add every superscript and confirm the total equals 79.

Comparison with Copper and Silver

The group 11 exception follows a trend:

  • Copper (Cu, Z=29): [Ar] 3d10 4s1 — shifts one 4s electron to complete the 3d subshell.
  • Silver (Ag, Z=47): [Kr] 4d10 5s1 — shifts one 5s electron to complete the 4d subshell.
  • Gold (Au, Z=79): [Xe] 4f14 5d10 6s1 — shifts one 6s electron to complete the 5d subshell.

In each case, the ns1 (n−1)d10 arrangement is more stable than ns2 (n−1)d9 because a completely filled d-subshell provides extra stabilization through exchange energy and, for gold, relativistic contraction of the 6s orbital.

Real-world applications

Gold's electron configuration gives it exceptional resistance to oxidation. The filled 5d subshell makes gold the most noble of all metals, which explains why it does not tarnish or corrode. This property, combined with excellent conductivity, makes gold indispensable in electronics (connectors, bonding wires, and printed circuit boards). Gold's malleability and ductility — a single gram can be hammered into a sheet of nearly one square meter — stem from the metallic bonding of its 6s1 electron.

Common oxidation states are +1 (removing the 6s1 electron) and +3 (removing 6s1 and two 5d electrons). Au(III) compounds are more common in aqueous chemistry.

Common mistakes

  • Writing 5d9 6s2: This follows the basic Aufbau order but ignores the group 11 stabilization. The correct ground state is 5d10 6s1.
  • Counting 80 or 78 electrons instead of 79: Double-check that superscripts sum to 79.
  • Forgetting the f-block: Gold is after the lanthanides, so 4f14 must be included. Students often skip the 4f subshell.
  • Confusing Au+ with Au: The Au+ ion removes the 6s1 electron first, giving [Xe] 4f14 5d10.

Gold reference table

Item Value
Atomic number 79
Full configuration 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s1
Noble-gas notation [Xe] 4f14 5d10 6s1
Valence clue 6s1
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 79 for a neutral Gold 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 [Xe], not a random previous element.

Common questions

What is the electron configuration of Gold?

The neutral Gold atom is written as 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s1. The shorthand form is [Xe] 4f14 5d10 6s1.

How many valence electrons does Gold have?

Start from the outer-shell clue 6s1. For main-group elements this usually gives a direct valence count; for transition metals, inspect both s and d electrons carefully.

Should I memorize this configuration?

Memorize the filling pattern first. Individual configurations become easier when you can rebuild them from atomic number, noble-gas cores, and periodic-table position.

What are the common oxidation states of Gold?

The d-block position and outer-shell configuration 6s1 determine the most stable ions. Gold commonly forms +1 and +3, with +3 being more stable in aqueous solution.

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

Element-specific practice problems

Problem 1: Write the full electron configuration for neutral Gold and verify the electron count.

Problem 2: Convert the full configuration to noble-gas shorthand notation.

Problem 3: Predict the electron configurations of Au+ and Au3+. Explain which electrons are removed first.

Problem 4: Compare the configuration of Gold with Copper and Silver in group 11. What pattern do all three exceptions share?

Problem 5: Without looking at the periodic table, derive the configuration from atomic number 79. Fill each subshell in Aufbau order and keep a running total. Check your answer against the configuration shown on this page.

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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

Browse all element configurations

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Electron configuration of Rutherfordium (Rf) Read the Rutherfordium electron configuration, noble-gas shorthand, valence shell, orbital filling logic, and the mistakes to avoid when writing Rf. Electron configuration of Samarium (Sm) Read the Samarium electron configuration, noble-gas shorthand, valence shell, orbital filling logic, and the mistakes to avoid when writing Sm. Electron configuration of Scandium (Sc) Read the Scandium electron configuration, noble-gas shorthand, valence shell, orbital filling logic, and the mistakes to avoid when writing Sc. Electron configuration of Seaborgium (Sg) Read the Seaborgium electron configuration, noble-gas shorthand, valence shell, orbital filling logic, and the mistakes to avoid when writing Sg. Electron configuration of Selenium (Se) Read the Selenium electron configuration, noble-gas shorthand, valence shell, orbital filling logic, and the mistakes to avoid when writing Se. 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Electron configuration of Thallium (Tl) Read the Thallium electron configuration, noble-gas shorthand, valence shell, orbital filling logic, and the mistakes to avoid when writing Tl. Electron configuration of Thorium (Th) Read the Thorium electron configuration, noble-gas shorthand, valence shell, orbital filling logic, and the mistakes to avoid when writing Th. Electron configuration of Thulium (Tm) Read the Thulium electron configuration, noble-gas shorthand, valence shell, orbital filling logic, and the mistakes to avoid when writing Tm. Electron configuration of Tin (Sn) Read the Tin electron configuration, noble-gas shorthand, valence shell, orbital filling logic, and the mistakes to avoid when writing Sn. Electron configuration of Titanium (Ti) Read the Titanium electron configuration, noble-gas shorthand, valence shell, orbital filling logic, and the mistakes to avoid when writing Ti. Electron configuration of Tungsten (W) Read the Tungsten electron configuration, noble-gas shorthand, valence shell, orbital filling logic, and the mistakes to avoid when writing W. Electron configuration of Uranium (U) Read the Uranium electron configuration, noble-gas shorthand, valence shell, orbital filling logic, and the mistakes to avoid when writing U. Electron configuration of Vanadium (V) Read the Vanadium electron configuration, noble-gas shorthand, valence shell, orbital filling logic, and the mistakes to avoid when writing V. Electron configuration of Xenon (Xe) Read the Xenon electron configuration, noble-gas shorthand, valence shell, orbital filling logic, and the mistakes to avoid when writing Xe. Electron configuration of Ytterbium (Yb) Read the Ytterbium electron configuration, noble-gas shorthand, valence shell, orbital filling logic, and the mistakes to avoid when writing Yb. 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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