Why is Gold a Conductor? (+ 3 Facts to Know)

Yes, gold is a good conductor of electricity. It possesses good conductivity due to its high number of free electrons and low resistivity. ¹ Gold’s atomic structure allows for the easy movement of electrons, enabling efficient electrical conduction.

Well, this was just a simple answer. But there are few more things to know about this topic which will make your concept super clear.

So let’s dive right into it.

Explanation: Why is gold a conductor?

Gold is a conductor because it possesses a high electrical conductivity. Its atoms have a unique arrangement of electrons that allows for the efficient flow of electric current. ²

Gold is a metal and belongs to a group of elements known as transition metals. ³ Within a gold atom, the outermost shell, or valence shell, contains one electron. This electron is loosely held by the nucleus, making it relatively easy for it to move from one atom to another.

In a solid gold material, the valence electrons can move freely throughout the lattice structure, creating what is known as a “sea of electrons.” When an electric field is applied, these free electrons can drift in the direction of the field, facilitating the flow of electric current. ⁴

Additionally, gold’s atomic structure contributes to its conductivity. The arrangement of gold atoms allows for efficient electron movement, with minimal resistance or scattering.

This makes gold an excellent conductor of electricity, along with other properties like high thermal conductivity and resistance to corrosion.

Overall, gold’s high electrical conductivity is a result of its unique electron configuration and atomic structure, which allow for the efficient movement of electrons and the flow of electric current.

How does the temperature affect the electrical conductivity of gold?

Temperature does have an effect on the electrical conductivity of gold. Generally, as the temperature increases, the electrical conductivity of gold decreases. ⁵

This phenomenon can be understood by considering the behavior of electrons in a metal. At lower temperatures, the electrons in gold have less thermal energy and move with less random motion. This results in fewer collisions between the electrons and impurities or defects in the crystal lattice, allowing for more efficient electron flow and higher conductivity.

However, as the temperature rises, the increased thermal energy causes the atoms in the lattice to vibrate more vigorously. These vibrations can scatter the electrons, increasing the resistance to their movement. Consequently, the electrical conductivity of gold decreases with increasing temperature.

This relationship between temperature and electrical conductivity is described by the temperature coefficient of resistivity, which quantifies the change in resistance with temperature. ⁶ For most metals, including gold, the temperature coefficient of resistivity is positive, meaning that the resistance and resistivity increase as the temperature rises.

In summary, the increase in temperature disrupts the orderly movement of electrons in gold, leading to more scattering and higher resistance, ultimately resulting in a decrease in electrical conductivity.

Uses of gold as a conductor

Gold is widely used as a conductor in various applications due to its excellent electrical conductivity. Here are some of its common uses:

• Electronics: Gold is extensively used in the electronics industry for its superior conductivity and resistance to corrosion. ⁷ It is employed in the production of connectors, switches, and other electrical contacts. Gold-plated connectors are particularly valuable in high-end audio and video equipment, computer components, and aerospace electronics, where reliable and low-resistance electrical connections are essential.
• Circuitry: Gold is utilized in the manufacturing of printed circuit boards (PCBs) and integrated circuits (ICs). ⁸ Its high conductivity allows for efficient transmission of signals and data across electronic devices. Gold wire bonding is also employed in microelectronics to create reliable interconnections between semiconductor chips and packaging.
• Thin-Film Technology: Gold thin films find applications in various technologies, including solar cells, touchscreens, and flat-panel displays. The thin layer of gold provides excellent electrical conductivity while also offering optical properties for reflection, transmission, or absorption of light.
• Medical Devices: Gold is used in medical devices such as pacemakers, hearing aids, and implantable electrodes. ^{9 10} Its biocompatibility, resistance to corrosion, and electrical conductivity make it suitable for these applications. Gold-plated electrodes are commonly employed for electrocardiography (ECG) and electroencephalography (EEG) measurements.
• Aerospace and Satellite Technology: Gold-coated or gold-plated components are utilized in aerospace and satellite technology due to their high reliability, low contact resistance, and resistance to the harsh conditions of space environments. ¹¹

In summary, gold’s exceptional electrical conductivity and corrosion resistance make it indispensable in a wide range of applications, including electronics, circuitry, thin-film technology, medical devices, and aerospace technology.

Further reading

Why is Brass a Conductor?
Is Carbon a Conductor?
Why is Graphite Conductive?
Is Graphite a Metal?
Is Graphite an Element? 

1. Conductivity. (n.d.). Conductivity. https://www.lehigh.edu/~amb4/wbi/kwardlow/conductivity.htm
2. Gold. (n.d.). Gold. https://nature.berkeley.edu/classes/eps2/wisc/gold.html
3. Boudreaux, K. A. (n.d.). The Parts of the Periodic Table. The Parts of the Periodic Table. https://www.angelo.edu/faculty/kboudrea/periodic/trans_transition.htm
4. Lang, P. F. (2018, August 22). Is a Metal “Ions in a Sea of Delocalized Electrons?” Journal of Chemical Education, 95(10), 1787–1793. https://doi.org/10.1021/acs.jchemed.8b00239
5. Hoc, N. Q., Tinh, B. D., & Hien, N. D. (2020, August). Influence of temperature and pressure on the electrical resistivity of gold and copper up to 1350 K and 100 GPa. Materials Research Bulletin, 128, 110874. https://doi.org/10.1016/j.materresbull.2020.110874
6. Electrical resistivity and conductivity – Wikipedia. (2019, March 24). Electrical Resistivity and Conductivity – Wikipedia. https://en.wikipedia.org/wiki/Electrical_resistivity_and_conductivity
7. Gold and the electronics sector. (2018, July 4). World Gold Council. https://www.gold.org/goldhub/research/gold-investor/gold-investor-july-2018/13231
8. Kasper, A. C., & Veit, H. M. (2018, September). GOLD RECOVERY FROM PRINTED CIRCUIT BOARDS OF MOBILE PHONES SCRAPS USING A LEACHING SOLUTION ALTERNATIVE TO CYANIDE. Brazilian Journal of Chemical Engineering, 35(3), 931–942. https://doi.org/10.1590/0104-6632.20180353s20170291
9. Kypta, A., Blessberger, H., Lichtenauer, M., Lambert, T., Kammler, J., & Steinwender, C. (2016, February 23). Gold-coated pacemaker implantation for a patient with type IV allergy to titanium. PubMed Central (PMC). https://doi.org/10.1016/j.ipej.2016.02.009
10. Kypta, A., Blessberger, H., Lichtenauer, M., Lambert, T., Kammler, J., & Steinwender, C. (2015, November). Gold-coated pacemaker implantation for a patient with type IV allergy to titanium. Indian Pacing and Electrophysiology Journal, 15(6), 291–292. https://doi.org/10.1016/j.ipej.2016.02.009
11. As Good As Gold: Are Satellites Covered in Gold Foil? (2016, August 29). National Environmental Satellite, Data, and Information Service. https://www.nesdis.noaa.gov/news/good-gold-are-satellites-covered-gold-foil