|
|
|
|
|
|
|
|
|
|
Mendelevium
Mendelevium was created by a team of scientists: Stanley G. Thompson, Glenn T. Seaborg, Bernard G. Harvey, Gregory R. Choppin and Albert Ghiorso. Albert Ghiorso was a physicist and the leader of the team. Mendelevium was the ninth transuranium element, discovered from the team at the University of California at Berkeley in 1955. The chemists created the first isotope (256Md) by forcing together 253 Einsteinium and helium nuclei. They used a cyclotron for this process in hopes of finding heavier elements. Mendelevium was created from 17 atoms in a 60 inch cyclotron.
The scientists decided to name this element after Dmitry Mendeleyev, a Russian chemist and creator of the periodic table.
The equation of Mendelevium:
42He + 25399Es -> 256101Md + 10n
Mendelevium is a man made element and has still not been found in the earths crust. This element has only been made for scientist purposes and therefore has no uses outside of the lab.
The element was originally going to have the symbol Mv, but then decided on Md. The name was approved by the International Union of Pure and Applied Chemistry in Geneva in 1997.
Albert Ghiorso
 http://www.casaciencias.org/mendeleweb/images/characters/95_big.jpg |
Ghiorso was born in Vallejo, California, but grew up in Alameda. He graduated from University of California at Berkley with a degree in electronic engineering in 1937. In 1941 Ghiorso was hired to install intercom systems to connect to the secretaries desks and the Radiation Lab. Albert Ghiorso's wife, Wilma Belt, was a secretary at the Radiation Lab at Berkley that he married after World War II. |
Dmitry Ivanovich Mendeleyev (Mendeleev)
Dmitry Mendeleyev was born in Tobolsk, Siberia in 1834. He was the youngest of all of his siblings. After Mendeleyev's father died, his mother took him to study in Moscow and St. Petersburg. Unfortunately, not long after his mother and sister died from tuberculosis. Dmitry got his Ph. D in 1865. Mendeleyev became interested in John Dalton and arranging atoms. He arranged some elements pertaining to their properties. Dmitry also noticed that some elements had gaps in between and predicted that those were for elements that weren't discovered yet. It turned out that his predictions turned out to be almost accurate. Mendeleyev ended up dying in 1907 due to pneumonia.
The Periodic Table created by Dmitry Mendeleyev
http://web.fccj.org/~ethall/2045/ch5/pt1871.gif
