Atomic / phase data
Reference values are evaluated.
Diamond-cubic structure
Ordinary crystalline germanium has the diamond-cubic network.
Semiconductor story
Band behavior is described conceptually; atomic orbitals are not presented as band calculations.
Supply geography
By-product recovery context is kept distinct from dedicated mining.
The lens describes evidence status, not confidence theatre. “Unknown” is kept unknown, and teaching schematics are not presented as direct measurements.
Germanium (Ge)
Germanium is element 32, a Group 14 metalloid whose tetrahedral crystal and semiconductor behavior helped launch solid-state electronics. Today it also matters in infrared optics, fiber-optic systems and specialized semiconductor devices.
Germanium atomic number, mass, electron configuration and key properties
Germanium: quick answers
How many protons, neutrons and electrons does germanium have?
Germanium’s atomic number is 32, so every germanium atom has 32 protons, and a neutral atom also has 32 electrons. Its most common natural isotope, germanium-74, has 42 neutrons (other isotopes have different neutron counts).
What is the symbol for germanium?
The chemical symbol for germanium is Ge.
Is germanium a solid, liquid or gas at room temperature?
Germanium is a solid at room temperature (about 25 °C).
What family (group) is germanium in?
Germanium is a metalloid, in group 14, period 4 of the periodic table.
How many valence electrons does germanium have?
Germanium has 4 valence electrons, the electrons in its outer shell, which matches its position in group 14.
What is the electron configuration of germanium?
The ground-state electron configuration of germanium is [Ar] 3d¹⁰ 4s² 4p².
From atomic number to chemistry
Read these as a chain of causes, not as isolated facts. Each step links to the concept hub if you want the underlying idea explained.
32 protons define germanium.
The reference ground-state configuration frames atomic and chemical behavior.
Periodic position organizes recurring trends without replacing element-specific evidence.
The teaching nucleus is one isotope, not the relative atomic mass.
Phase claims preserve measured/evaluated/predicted/unknown evidence labels.
Germanium in its period and family
Germanium lies in Group 14 between silicon and tin. The ns²np² valence pattern supports tetrahedral covalent networks and +4/+2 chemistry, while its heavier atom gives different band and optical behavior from silicon.
Germanium Visual Lab
Rotate a ⁷⁴Ge nucleus and diamond-cubic teaching network, inspect 4s/4p probability clouds, then connect tetrahedral bonding to semiconductor behavior and infrared/optical applications.
Every mark points to one exact feature
The numbered markers explain the same information system used throughout Element Lookup. Unknown or predicted fields remain visibly labelled rather than being replaced with guesses.
Germanium in one minute
Atomic number 32 means 32 protons.
Neutral germanium has [Ar] 3d¹⁰ 4s² 4p².
Germanium is commonly classified as a metalloid and semiconductor.
Its ordinary crystal is diamond cubic, related structurally to silicon and diamond carbon.
Mendeleev predicted an eka-silicon before germanium was discovered.
Shell rings organize electron counts. They are not electron trajectories or orbital shapes.
2 · 8 · 18 · 4 electrons
The 4s/4p orbital clouds are isolated-atom teaching models. Semiconductor bands arise from many-atom crystal interactions and must not be read directly from one orbital cloud.
Crystalline germanium adopts the diamond-cubic network. The viewer uses a conventional tetrahedral-network teaching cell and does not claim exact thermal-displacement or defect information.. The viewer is evidence-aware: measured structures are identified as such; unknown bulk structures stay unknown.
Teaching visualization; not a literal finite sample or thermal trajectory.What this model does—and does not—show
The 4s/4p orbital clouds are isolated-atom teaching models. Semiconductor bands arise from many-atom crystal interactions and must not be read directly from one orbital cloud.
Where do I meet germanium?
Clickable learning cards connect the element to materials, environment, technology, biology or research - depending on what the evidence actually supports.
Semiconductor history
Germanium was crucial in early transistor development and remains useful in specialized semiconductor devices.
Mendeleev prediction → diamond-cubic semiconductor → infrared technology
Germanium links one of chemistry’s classic successful predictions to tetrahedral bonding and modern semiconductor/optical applications.
Eka-silicon
Mendeleev predicted a Group 14 element with properties close to later-measured germanium.
Silicon, germanium and tin
Four outer electrons persist while bonding and metallic character evolve down the group.
| Structure | diamond cubic |
|---|---|
| Context | semiconductor |
| Structure | diamond cubic |
|---|---|
| Context | semiconductor |
| Allotropy | α / β |
|---|---|
| Context | more metallic |
Germanium properties: atomic, physical, thermal and chemical
Categories follow the science of this element rather than a fixed decorative template. Each row carries condition/provenance context and an evidence label; unknown values stay unknown.
| Property | Value | Context / provenance | Evidence |
|---|---|---|---|
| Atomic number | 32 | Source-reviewed; see Sources below | Evaluated |
| Relative atomic mass | 72.630 | Source-reviewed; see Sources below | Evaluated |
| Ground-state electron configuration | [Ar] 3d¹⁰ 4s² 4p² | Source-reviewed; see Sources below | Evaluated |
| Group / period / block | Group 14 · Period 4 · p-block | Periodic-table placement | Evaluated |
| Electronegativity | 2.01 | Source-reviewed; see Sources below | Evaluated |
| Reference isotope | ⁷⁴Ge | Source-reviewed; see Sources below | Evaluated |
| Property | Value | Context / provenance | Evidence |
|---|---|---|---|
| State context | Hard brittle gray-white metalloid · solid at 20 °C | Source-reviewed; see Sources below | Evaluated |
| Density | 5.323 g/cm³ | Source-reviewed; see Sources below | Evaluated |
| Material / molecular structure | Germanium · diamond-cubic structure | Crystalline germanium adopts the diamond-cubic network. The viewer uses a conventional tetrahedral-network teaching cell and does not claim exact thermal-displacement or defect information. | Measured |
| Classification | Metalloid | Periodic-table / chemistry classification | Evaluated |
| Structure-model scope | Crystalline germanium adopts the diamond-cubic network. The viewer uses a conventional tetrahedral-network teaching cell and does not claim exact thermal-displacement or defect information. | Teaching visualization; exact crystallographic coordinates are not implied unless stated. | Reviewed |
| Property | Value | Context / provenance | Evidence |
|---|---|---|---|
| Melting / transition reference | 1211.4 K | Source-reviewed; see Sources below | Evaluated |
| Boiling / gas reference | 3106 K | Source-reviewed; see Sources below | Evaluated |
| Phase-path context | At approximately standard pressure, crystalline germanium remains solid to about 1211.4 K, liquid to about 3106 K, and gaseous above the boiling reference. | Shared phase registry drives the slider, regions and markers. | Evaluated |
| Condition warning | Temperature and pressure define phase behavior; purity/allotropy may matter. | Teaching condition statement | Reviewed |
| Property | Value | Context / provenance | Evidence |
|---|---|---|---|
| Common oxidation states | +4, +2, −4 | Source-reviewed; see Sources below | Evaluated |
| Ion / common ion context | Element-specific; see chemistry sections | Source-reviewed; see Sources below | Evaluated |
| Periodic chemistry context | Germanium lies in Group 14 between silicon and tin. The ns²np² valence pattern supports tetrahedral covalent networks and +4/+2 chemistry, while its heavier atom gives different band and optical behavior from silicon. | Element-specific interpretation | Reviewed |
| Chemistry caution | Elemental form, ions and compounds are distinct chemical objects. | Interpretive teaching rule | Reviewed |
| Property | Value | Context / provenance | Evidence |
|---|---|---|---|
| ⁷⁴Ge | Stable natural isotope | Reference teaching nucleus with 32 protons and 42 neutrons. | Evaluated |
| ⁷⁶Ge | Very long-lived double-beta-decay isotope | Important in rare-event nuclear-physics research. | Evaluated |
| Germanium isotope context | Multiple stable/very long-lived natural isotopes | Relative atomic mass is an abundance-weighted value. | Evaluated |
| Teaching nucleus | ⁷⁴Ge · 32 protons + 42 neutrons | Reference isotope used in the nucleus model | Reviewed |
| Property | Value | Context / provenance | Evidence |
|---|---|---|---|
| Page evidence note | Atomic and ordinary bulk values are evaluated. The diamond-cubic viewer is a topology-focused conventional teaching model. Supply geography is by-product context rather than a claim of native germanium deposits. | Evidence summary for this guide | Reviewed |
| Structure evidence | Crystalline germanium adopts the diamond-cubic network. The viewer uses a conventional tetrahedral-network teaching cell and does not claim exact thermal-displacement or defect information. | Measured structure, labelled schematic, prediction or explicit unknown as applicable. | Reviewed |
| Map evidence rule | Real pins are reviewed examples; conceptual layers are used when pins would mislead. | Geography Explorer 2.0 | Reviewed |
| Source set | 3 primary/reference links listed below | Open the Sources section for the actual references. | Reviewed |
Is Germanium a solid, liquid or gas? State at temperature
At approximately standard pressure, crystalline germanium remains solid to about 1211.4 K, liquid to about 3106 K, and gaseous above the boiling reference.
Where on Earth is Germanium found or produced?
Who discovered Germanium, and when?
Mendeleev predicted eka-silicon and several of its properties.
Clemens Winkler isolated germanium from the mineral argyrodite.
Germanium became central to early semiconductor diodes and transistors.
Germanium serves specialty semiconductor, infrared and fiber-optic markets.
From by-product streams to high-purity germanium
Germanium occurs dispersed in certain zinc, coal and other mineral/material streams.
Industrial recovery concentrates germanium compounds from suitable process residues or ores.
High-purity refining supports semiconductor and optical grades; this guide does not provide process recipes.
End uses include electronics, infrared optics, fiber systems and specialized catalysts/materials.
What is germanium used for?
Infrared optics
Germanium lenses/windows are used in selected infrared imaging systems.
Semiconductors
Germanium and Ge-containing materials support high-speed and specialty devices.
Fiber optics
Germanium dioxide is used in controlled glass compositions for optical fibers.
Research
Germanium detectors and semiconductor heterostructures are important in scientific instrumentation.
Germanium isotopes and natural abundance
⁷⁴Ge
Stable natural isotopeReference teaching nucleus with 32 protons and 42 neutrons.
⁷⁶Ge
Very long-lived double-beta-decay isotopeImportant in rare-event nuclear-physics research.
Germanium isotope context
Multiple stable/very long-lived natural isotopesRelative atomic mass is an abundance-weighted value.
Five-question Germanium check
What is germanium’s atomic number?
How is germanium commonly classified?
What crystal structure does ordinary germanium adopt?
How many simple valence electrons?
Why is “one orbital cloud” not the semiconductor band structure?
Germanium questions students commonly ask
Each answer starts with the direct fact, then explains the chemistry, evidence or material context so the result is understandable rather than merely memorized.
Is germanium a metal?
Short answer: Germanium is usually classified as a metalloid and is a semiconductor rather than an ordinary metal.
This guide classifies Germanium as a metalloid. Its periodic position is Period 4, p-block, Group 14. Germanium lies in Group 14 between silicon and tin. The ns²np² valence pattern supports tetrahedral covalent networks and +4/+2 chemistry, while its heavier atom gives different band and optical behavior from silicon.
Key point: Periodic-table classification describes recurring atomic/chemical behavior; it does not make every element in a column physically identical.
Is germanium a metalloid?
Short answer: Yes, that is its common periodic-table classification.
This guide classifies Germanium as a metalloid. Its periodic position is Period 4, p-block, Group 14. Germanium lies in Group 14 between silicon and tin. The ns²np² valence pattern supports tetrahedral covalent networks and +4/+2 chemistry, while its heavier atom gives different band and optical behavior from silicon.
Key point: Periodic-table classification describes recurring atomic/chemical behavior; it does not make every element in a column physically identical.
How many valence electrons does germanium have?
Short answer: Four in the simple outer-shell count, 4s²4p².
The neutral-atom ground-state reference used on this page is [Ar] 3d¹⁰ 4s² 4p². This is an isolated-atom reference: bonding and ion formation can change which outer electrons are present or chemically active. The listed common oxidation-state context is +4, +2, −4, which helps connect the atomic configuration to ordinary chemistry without treating electron counting as a single universal rule.
Key point: Electron configuration is a ground-state atomic reference, not a literal picture of every compound.
What is germanium used for?
Short answer: Important uses include infrared optics, fiber-optic materials and specialized semiconductors.
Infrared optics: Germanium lenses/windows are used in selected infrared imaging systems. Semiconductors: Germanium and Ge-containing materials support high-speed and specialty devices. Germanium is not simply “a metal” or “a nonmetal.” Its diamond-cubic network and band structure make metalloid/semiconductor language more useful than forcing it into a simple metallic category.
Key point: Always distinguish the pure element from the compound, alloy, isotope or device material that actually performs the application.
What is germanium’s electron configuration?
Short answer: [Ar] 3d¹⁰ 4s² 4p².
The neutral-atom ground-state reference used on this page is [Ar] 3d¹⁰ 4s² 4p². This is an isolated-atom reference: bonding and ion formation can change which outer electrons are present or chemically active. The listed common oxidation-state context is +4, +2, −4, which helps connect the atomic configuration to ordinary chemistry without treating electron counting as a single universal rule.
Key point: Electron configuration is a ground-state atomic reference, not a literal picture of every compound.
Who discovered germanium?
Short answer: Clemens Winkler isolated it in 1886 after Mendeleev had predicted eka-silicon.
In 1869, Mendeleev predicted eka-silicon and several of its properties. In 1886, Clemens Winkler isolated germanium from the mineral argyrodite.
Key point: Discovery credit follows the historical evidence and accepted attribution, not just the earliest claim.
Scientific sources for Germanium
- Royal Society of Chemistry - Germanium
- NIST - Atomic Data for Germanium
- USGS - Mineral Commodity Summaries 2026
Questions to ask next about Germanium
A good element lesson should lead to the next useful question, not end after a list of facts.
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