Gold combines a distinctive yellow appearance with low reactivity and electrical conductivity. Its softness makes alloys useful for durable jewelry, while thin coatings protect electrical contacts. The same element can therefore serve as decoration and as a material chosen to maintain a reliable electrical connection.
FROM ELEMENT TO APPLICATION
AN ELEMENT IN CONTEXT
Why coat a connector with gold while using another material for most of its body?
Gold-plated connector surface
FOLLOW THIS RELATIONSHIP
Identify the electrical-contact surface
A connector needs a stable interface through which charge can pass. Most of its supporting geometry can be supplied by a different underlying material.
Explore the model (optional)
AuFORM → INTERACTION → CONSEQUENCE
Follow the explanation in either direction. These are authored steps, not a physical clock.
Optional: check your understanding
USE THE EXPLANATION
Which statement correctly separates the coating and substrate roles?
Atomic identity, reference properties and structure models
INTERACTIVE 3D79 visible sites
An electron censusDrag to rotate · scroll or pinch to zoom
[Xe] 4f14 5d10 6s1. Grouping electrons by principal shell connects the neutral-atom configuration to periodic-table patterns.
What this representation means
A three-dimensional counting diagram. Dots are count markers, not measured electron positions; spherical placement and spacing are arbitrary. There are no electron trajectories here. Orbitals describe quantum states.
Gold was known and worked in prehistory, helped by its occurrence as recognizable native metal. Egyptian mining developed in antiquity, and electrum coins appeared in Lydia in the seventh century BCE. Electrum is a gold–silver , so even a familiar phrase such as gold coin can hide compositional detail. Gold's history links geology, craft, and exchange long before a modern explanation of metallic bonding existed.
Gold can occur as native particles in rock veins and in sediment concentrated by weathering and transport. Other associations also occur, including tellurides. A visible nugget represents only one geological form. The movement of rock and water helps explain why gold-bearing sediment may lie away from its original bedrock source.
Gold is soft, readily shaped, and resistant to many corrosive environments. It can be alloyed for harder objects or applied as a thin surface coating. Its optical response also makes it useful for infrared reflection. Mechanical strength, surface chemistry, and wavelength-dependent reflection are separate reasons for selecting a gold-containing material.
Each section links its supporting references. Descriptions and diagrams were authored for this atlas. Source checks completed. Source checks dated 2026-09-06.
CITE THIS PAGE
Family labels and the group-3 layout are teaching conventions. A table position does not establish an unknown bulk property. Electronic configurations refer to neutral atoms; ions and material environments require their own account.
Read each reference property together with its units, conditions and the reference information below.
Not yet recorded: electron affinity, second ionization energy, ground-state term symbol, van der waals radius, thermal conductivity, specific heat capacity, electrical resistivity, crystal structure, lattice parameter a, space group, abundance in seawater, abundance in the universe, annual production, supply-risk listing, hazard classification, biological role, cas registry number, pubchem cid, wikidata item. These families are declared and awaiting an ingestion run against the source each names; they are listed here rather than shown as empty rows.
Physical
Intended reference: CRC Handbook of Chemistry and Physics · CRC Press
Phase at 20 °C
solid
293.15 K, 101.325 kPa
Melting point in K
1337 K
at standard pressure unless noted
Boiling point in K
3129 K
101.325 kPa
Density in g/cm³
19.3 g/cm³
solids and liquids at 293 K; gases at 273 K and 101.325 kPa
Atomic and electronic
Intended reference: Pauling electronegativity scale · Widely tabulated; original in The Nature of the Chemical Bond
Electronegativity in Pauling
2.54 Pauling
Pauling scale
First ionization energy in kJ/mol
890.1 kJ/mol
gas-phase neutral atom, ground state
Covalent radius in pm
136 pm
single-bond covalent radius
Common oxidation states
+1, +3
states met in ordinary compounds; not exhaustive
Occurrence and identity
Intended reference: CRC Handbook of Chemistry and Physics · CRC Press
Abundance in the crust in mg/kg
0.004 mg/kg
upper continental crust, mass fraction
Has stable isotopes
Yesderived
Discovery year
Not recorded
WHERE IT SITS AMONG ITS NEIGHBORS
Electronegativity across period 6
Au 2.54 Pauling · Gold
Electronegativity across period 6. Exact values.
Cs
0.79
Ba
0.89
La
1.1
Ce
1.12
Pr
1.13
Nd
1.14
Sm
1.17
Eu
1.2
Gd
1.2
Tb
1.1
Dy
1.22
Ho
1.23
Er
1.24
Tm
1.25
Yb
1.1
Lu
1.27
Hf
1.3
Ta
1.5
W
2.36
Re
1.9
Os
2.2
Ir
2.2
Pt
2.28
Au
2.54
Hg
2
Tl
1.62
Pb
2.33
Bi
2.02
Po
2
At
2.2
Electronegativity down group 11
Au 2.54 Pauling · Gold
Electronegativity down group 11. Exact values.
Cu
1.9
Ag
1.93
Au
2.54
The trend uses the same reference-property values as the periodic table. Elements with no recorded value are left out of the line rather than drawn at zero.
