Atomic Numbers 91 through 100
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to elements 81-90
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to elements 101 to 110Element Information
Atomic Numbers 91 through 100
Go
to elements 81-90
Return to periodic table
Go
to elements 101 to 110
This page contains basic information on elements with atomic numbers 91 through 100. I have tried to make sure the information here is correct, but if you find a mistake, please e-mail me at apurdy@centurytel.net, and I will correct it as soon as possible.
Protactinium 
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The first isotope, protactinium-234, was
discovered in 1913 by Kasimir Fajans and O.H. Göhring. The long-lived isotope,
protactinium-231, was discovered in 1917 independently by Otto Hahn and Lise Meitner.
Uses - non known uses |
Uranium Click here to
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Although uranium was discovered in 1789
by Martin Heinrich Klaproth, it was first isolated in 1841 by Eugène-Melchior Péligot.
Uses - nuclear reactor fuel, synthesis of isotopes, x-ray targets for production of high energy x-rays |
Neptunium
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Edwin M.McMillan and Philip H. Abelson
first found neptunium in 1940 after uranium had been bombarded by neutrons.
Uses - a component in neutron detection instruments |
Plutonium
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Plutonium was first produced
artificially in 1940 as the isotope plutonium-238 by Glenn T. Seaborg, Edwin M. McMillan,
Joseph W. Kennedy, and Arthur C. Wahl. Later, traces were found in uranium ores
where it was naturally
produced. Uses - weapon fuel, pacemakers |
Americium
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Although americium is undetected in
nature, it was artificially produced in 1944 from plutonium-239 by Glenn T. Seaborg,Ralph
A. James, Leon O. Morgan, and Albert Ghiorso in a nuclear reactor.
Uses - smoke detectors, a portable source of gamma rays |
Curium Click here to
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Curium is undetected in nature, but it
was discovered in 1944 at the University of Chicago by Glenn T. Seaborg, Ralph A. James,
and Albert Ghiorso in plutonium-239 that had been bombarded by helium ions.
Uses - thermoelectric power, neutron source, was the alpha particle source for the Alpha Proton X-ray Spectrometer on Mars |
Berkelium
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Berkelium does not occur in
nature. It was discovered in 1949 by Stanley G. Thompson, Albert Ghiorso, and Glenn
T. Seaborg at the University of California at Berkeley as a product resulting from the
helium-ion bombardment of americium-241.
Uses - no known uses |
Californium
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Californium does not occur in nature,
but it was discovered in 1950 by Stanley G. Thompson, Kenneth Street, Jr., Albert Ghiorso,
and Glenn T. Seaborg at the University of California, Berkeley, as a product of the
helium-ion bombardment of curium-242.
Uses - neutron source, source of fission fragments for research, moisture gauges for the determination of water and oil-bearing layers in oil wells |
Einsteinium Click here to
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Einsteinium does not occur in nature,
but it was produced in 1952 by Albert Ghiorso and co-workers at Berkeley,California in
debris taken from the first thermonuclear or hydrogen bomb explosion in the South Pacific
in November of 1952.
Uses - no known uses |
Fermium Click here to
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Fermium does not occur in nature, but it
was positively identified by Albert Ghiorso and co-workers at Berkeley, California in
debris taken from the first hydrogen bomb explosion that took place in November of 1952 in
the South Pacific.
Uses - no known uses |
Go to elements 81 thru 90
Go to elements 101 to 110