Facts About Curium

Etymology: Cur was named after chemists and physicists Mary Curie and her husband Pierre Curie, the pioneer of understanding radiation.

Discovery: Kern was confirmed at the University of Chicago's Wartime Metallurgical Institute in 1944 by Gurnn Seaborg, Ralph James, Albert Ghiorso. It was manufactured as a result of -239 helium bombardment in a 60 inch cyclotron in Berkeley, California. cur follows the United States in the periodic system, but in fact it is the third synthetically manufactured transuranic element.

Cur is highly radioactive. As a metal, it is shiny and silver. It is ductile, chemically reactive and positively charged. The surface is rapidly oxidized in air to obtain a film. In a dilute solution, it rapidly dissolves to form a Cm (III) solution. Cur metal has two crystal structures: double hexagonal close-packed, high temperature, and face center are densely packed. [View the Periodic Table of the Elements]

Large amounts of divalent calcium compounds have never been observed. Most trivalent cur compounds are stable, pale yellow or yellowish green. Since cur isotopes can be obtained in large quantities, many cur compounds have been prepared and characterized. Most compounds are in trivalent state

When absorbed in the body, cur accumulates in the bone. That radiation destroys the formation of erythrocytes. Therefore, cur is considered to be very toxic

Cur is synthetic. 242 Cm and 244 Cm are orders of magnitude, but 248 Cm is produced in milligrams only.

Due to the very low neutron flux naturally present in the uranium ore, traces of cur can be present in the natural deposits of uranium as a result of neutron capture and beta decay. However, there is no evidence that there is a flow of nature today. However, it may have existed for a long time. The most stable isotope 247 cm has a half-life of 16 million years. This is relatively short compared to the age of the earth. In other words, if you have the original cur, it will disappear millions of years ago.

Currently cur is mainly used in basic science research. However, some of its isotopes have proven useful. 242 Cm generates about 3 watts of heat per gram and generates more heat than hydrazine. Both 242 Cm and 244 Cm are used as a power source for space and medical practices

Cur has 14 isotopes. Their masses range from 237 to 251. None of them are stable, but the half-life of 247 cm is about 15.6 million years. It collapses through alpha collapse to 243 Pu

The half-life of 242 Cm is 163 days, it declines from α decay to 238 Pu or by spontaneous fission decay.

The 247 cm isotope with the longest lifetime has a half-life of 15.6 million years. Therefore, while some of them can be detected as extinct radionuclides beyond their nearly stable daughters 235 U, any original cur, the cur existing on Earth during its formation now collapsed I should have done it. For research purposes, a small amount of Cur is artificially generated. It also occurs in spent fuel. Cur exists in nature in certain areas of atmospheric nuclear weapons experiments conducted between 1945 and 1980. Therefore, in the analysis of the first hydrogen explosion test site in the United States Ivy Mike (Enewetak, 1 November 1952) analysis of the atoll's remains, in addition to e, cadmium, strontium, and the USA, berkelium, calcium, and potash are also indicated It is. Isotopes, especially small amounts of 245 cm, 246 cm and 247 cm, 248 cm and 249 cm. Because of military secret reasons, this result was only announced in 1956.

Cur is a metal of silver. Its isotopes are all radioactive. In chemical studies cur - 242 (163 - day half life) was replaced by cur - 244 (18.1 year half - life) and the long - lived isotope cur - 248. Neutron irradiation Cur shows a normal + 3 oxidation state such as very weak yellow Cm 3+ ion, trioxide Cm 2 O 3, trihalide in aqueous solution, and other ternary acting elements and chemistry It is similar. The +4 oxidation state occurs in the carbon dioxide CmO 2 and the Cm 4 + ion complexes with the fluoride ion.