Helium: Difference between revisions

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Helium

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Noble gas:

Properties:

Inert, colorless, odorless, non-toxic, non-flammable gas

Uses:

Cryogenics, welding, inert purging gas, scientific uses

Helium is a chemical element, having the chemical symbol He and atomic number (number of protons) Z = 2. It has a standard atomic weight of 4.002602 g•mol⁻¹, and is typically found as a gas in its elemental form.

Helium is a monatomic noble gas. At a pressure of 101.325 kPa, it has a boiling point of -268.93 °C, and a melting point of -272.2 °C. It is of relatively low density--see Benchmark quantities.

The helium atom has two stable isotopes, ³H and ⁴He.

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-'''Helium''' is a [[Chemical elements|chemical element]], having the [[chemical symbol]] He. Its [[atomic number]] (the number of [[proton]]s) is 2. It has a [[Atomic mass#Standard atomic weights of the elements|standard atomic weight]] of 4.002602 g•mol<sup> −1</sup>, and is typically found as a [[gas]] in its elemental form.
+'''Helium''' is a [[Chemical elements|chemical element]], having the [[chemical symbol]] He and [[atomic number]] (number of [[protons]]) ''Z'' = 2. It has a [[Atomic mass#Standard atomic weights of the elements|standard atomic weight]] of 4.002602 g•mol<sup> −1</sup>, and is typically found as a [[gas]] in its elemental form.
 Helium is a monatomic noble gas. At a [[pressure]] of 101.325 k[[Pascal (unit)|Pa]], it has a [[boiling point]] of -268.93 °[[Celsius (unit)|C]], and a [[melting point]] of -272.2 °C.  It is of relatively low density--see [[Benchmark_quantities#Density|Benchmark quantities]].