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Name: Lawrencium
Symbol: LR
Atomic Number: 103
Atomic Mass: 262
Standard State:presumably a solid at 298 K
Group name: none
Period in Periodic Table: 7
Color: unknown, but probably metallic and silvery white or grey in appearance
Classification: Metallic

lawrencium is a synthetic "rare earth metal" which does not occur in the environment.
Element 103, lawrencium, was discovered in 1961 by Ghiorso and others in Berkeley, California, USA, who target with boron ions. They obtained perhaps two micrograms. Several lawrencium isotopes including those with masses 253, 254, 255, 256, 257, 258, 259, and 260 are known now.