Helium was discovered by Sir William Ramsay and independently by N. A. Langley and P. T. Cleve
at 1895 in London, England and Uppsala, Sweden.
Origin of name: from the Greek word "helios" meaning "sun".
Atomic Number: 2
Atomic Weight: 4.002602
Melting Point: 0.95 K (-272.2°C or -458.0°F)
Boiling Point: 4.22 K (-268.93°C or -452.07°F)
Density: 0.0001785 grams per cubic centimeter
Phase at Room Temperature: Gas
Element Classification: Non-metal
Period Number: 1 Group Number: 18 Group Name: Noble Gas