Helium (He) has atomic number 2 and is classified as a noble gas. It sits in Group 18, period 1 of the periodic table. Its practical relevance includes cryogenic cooling, leak detection, inert atmospheres and scientific instrumentation.
ELEMENT DATA
Quick facts
#Atomic number2
AaSymbolHe Relative
◉Atomic mass4.0026 State at room temperature Gas
⌘Group18
Position in the periodic table
Noble gases have filled valence shells and are relatively unreactive under ordinary conditions. Their inertness is valuable in lighting, welding, semiconductor processing, cryogenics and scientific instrumentation.
Helium belongs to period 1. Its position helps explain recurring trends such as atomic size, bonding behavior, oxidation states and the way it interacts with neighboring elements.
Why Helium matters
In engineering and technology, helium is associated with cryogenic cooling, leak detection, inert atmospheres and scientific instrumentation. The importance of the element may come from the pure element itself, from compounds containing it, or from its role as an alloying, electronic, catalytic or nuclear material.
Engineering and scientific context
Material behavior should never be inferred from the element name alone. Purity, isotope composition, crystal structure, processing history, temperature and the surrounding chemical environment can all change performance. In alloys and compounds, the contribution of helium depends on concentration and interaction with the other constituents.
Safety and handling
The hazards associated with Helium depend on its physical form, purity, compounds, process temperature and exposure route. Engineering decisions should use the applicable safety data sheet and project-specific risk assessment.
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