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helium

chemical element with the chemical symbol He and the atomic number of 2

  • He
  • element 2

Statements

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Helium discharge tube.jpg
3,008 × 2,008; 1.29 MB
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4.002602±0.000002 atomic mass unit
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4 March 2017
Standard Atomic Weights (English)
4.5
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180±1 metre per second
-268.9±0.1 degree Celsius
965±1 metre per second
0±1 degree Celsius
0.1785 kilogram per cubic metre
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-452.070 degree Fahrenheit
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-268.9 degree Celsius
1 atmosphere
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Helium
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Helium
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Identifiers

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1 reference
27 December 2018
Helium (English)
CAS no.: 7440-59-7 (English)
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