Elements

[Princess Royal]

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)

Some Facts:

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.

[Princess Royal]

Naming Elements

The names of elements are derived from Greek words. They give clue about the element's properties.

Elements/Symbols....................Greek word....................Meaning
Argon (Ar) .................................Argos.............................Inactive
Astatine (At) ..............................Astatos..........................Unstable
Barium (Ba) ................................Barys.............................Heavy
Bromine (Br) ...............................Bromos...........................Stench
Chlorine (Cl) ...............................Chloros...........................Pale green
Dysprosium (Dy) ..........................Dusprositos.....................Hard to get
Hydrogen (H) ..............................Hydro genes................... Water forming
Mercury (Hg) ..............................Hydrargyrum....................Liquid silver
Phosphrous (P) ...........................Phosphorus......................Bringer of light
Technetium (Tc) .........................Tekhnetos........................Artificial