Name:
Symbol:
Atomic number:
Molecular weight:
Group number:
Group name:
Period number:
CAS Registry ID:
UN Number(gas):
UN Number(liquid):
Helium
He
2
4.0026 g/mol
18
Rare gas
2
7440-59-7
UN1046
UN1963
Helium (Greek helios meaning "the sun")
was isolated by Sir William Ramsay in 1895, from clevite and conclusively
found not to be a metal, but the name was unchanged. Helium occurs
in economically extractable amounts in certain natural gases and
is used as a lifting gas for balloons and blimps, as a cryogenic
cooling liquid for super- conducting magnets and as a filler gas
for deep-sea diving.
