Actinium was discovered by Andre Debierne at 1899 in France.
Origin of name: from the Greek word "aktinos" meaning "ray".
Atomic Number: 89
Atomic Weight: 227
Melting Point: 1324 K (1051°C or 1924°F)
Boiling Point: 3471 K (3198°C or 5788°F)
Density: 10.07 grams per cubic centimeter
Phase at Room Temperature: Solid
Element Classification: Metal
Period Number:7 Group Number: none Group Name: Actinide