- Other light elements that are commonly proposed for the outer core are silicon, carbon, helium, and nitrogen.
- Ramsay realized that argon and helium might be members of a hitherto unsuspected new group in the Periodic Table.
- Cool the detectors with liquid nitrogen instead of solid hydrogen or liquid helium.
Helium occurs in traces in air, and more abundantly in natural gas deposits. It is used as a lifting gas for balloons and airships, and liquid helium (boiling point: 4.2 kelvins, −268.9°C) is used as a coolant. Helium is produced in stars as the main product of the thermonuclear fusion of hydrogen, and is the second most abundant element in the universe after hydrogen
Late 19th century: modern Latin, from Greek hēlios 'sun', because its existence was inferred from an emission line in the sun's spectrum.
Words that rhyme with heliumberkelium, epithelium, nobelium, Sealyham
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