Actinide
Discovery, isolation and synthesis
Like the lanthanides, the actinides form a family of elements with similar properties. Within the actinides, there are two overlapping groups: transuranium elements, which follow uranium in the periodic table—and transplutonium elements, which follow plutonium.

Actinide

Section Title: Discovery, isolation and synthesis
Table Section Text: Like the lanthanides, the actinides form a family of elements with similar properties. Within the actinides, there are two overlapping groups: transuranium elements, which follow uranium in the periodic table—and transplutonium elements, which follow plutonium.

Element	Year	Method

Neptunium	1940	Bombarding 238U by neutrons

Plutonium	1941	Bombarding 238U by deuterons

Americium	1944	Bombarding 239Pu by neutrons

Curium	1944	Bombarding 239Pu by α-particles

Berkelium	1949	Bombarding 241Am by α-particles

Californium	1950	Bombarding 242Cm by α-particles

Einsteinium	1952	As a product of nuclear explosion

Fermium	1952	As a product of nuclear explosion

Mendelevium	1955	Bombarding 253Es by α-particles

Nobelium	1965	Bombarding 243Am by 15N or 238U with 22Ne

Lawrencium	1961 –1971	Bombarding 252Cf by 10B or 11B and of 243Am with 18O

Sentence(s)

Bombarding curium-242 with α-particles resulted in californium (1950), and a similar procedure yielded in 1949 berkelium from americium-241.

final_sentence: Bombarding curium-242 with α-particles resulted in californium (1950), and a similar procedure yielded in 1949 berkelium from americium-241.