Elements Produced Artificially
1. Technetium, in 1937, by C. Perrier & E. Segre (Italy/USA)
2. Astatine, in 1940, by D.R. Corson & others (USA)
3. Neptunium, in 1940, by E.M. McMillan & P. Abelson (USA)
4. Plutonium, in 1940, by G. Seaborg & others (USA)
5. Curium, in 1944, by G. Seaborg & others (USA)
6. Americium, in 1945, by G. Seaborg & others (USA)
7. Promethium, in 1945, by J.A. Marinsky & others (USA)
8. Berkelium, in 1949, by S.G. Thompson & others (USA)
9. Californium, in 1950, by S.G. Thompsons & others (USA)
10. Einsteinium, in 1952, by A. Ghiorso & others (USA)
11. Fermium, in 1953, by A. Ghiorso & others (USA)
12. Mendelevium, in 1958, by A. Ghiorso & others (USA)
13. Nobelium, in 1958, by A. Ghiorso & others (USA/USSR)
14. Lawrencium, in 1961, by A. Ghiorso & others (USA/USSR)
15. Rutherfordium, in 1964, by G.Flerov (USSR)
16. Dubnium, in 1968, by A. Ghiorso (USA)
17. Seborgium, in 1974, by A. Ghiorso (USA); G. Flerov (USSR)
18. Bohrium, in 1976, by G. Munzenburg (Germany)
19. Meitnerium, in 1982, by P. Armbruster (Germany)
20. Hassium, in 1984, by P. Armbruster (Germany)
1.Astatine is the rarest element on Earth. The rarest metal is rhodium.
2. At room temperature, osmium is the densest element, and lithium the least dense solid element.
3. Hydrogen and helium are the most abundant elemens in the universe.
4. The tissues of the human body are made up of hydrogen, carbon, oxygen, nitrogen, and bones contain calcium. Together these five elements
account for 98% of the body's mass.