Mendelevium

Mendelevium (pronounced /ˌmɛndəˈlɛviəm/) is a synthetic, radioactive transuranic chemical element with the symbol Md and the atomic number 101.

History

Mendelevium was the ninth transuranic element to be synthesized. It was first synthesized by Albert Ghiorso, Glenn T. Seaborg, Gregory Robert Choppin, Bernard G. Harvey, and team leader Stanley G. Thompson in early 1955 at the University of California, Berkeley. It was named after Dmitri Mendeleev, the creator of the periodic table, and it used to have the symbol Mv but it was later changed in 1957.

Chemistry

Mendelevium is created by bombarding einsteinium with alpha particles. Mendelevium is a metallic element whose most stable isotope is Md-258 with a half-life of 51.6 days. Mendelevium's chemistry is not yet well known, but it can form some complex compounds.

forcefully combining and was named after Dmitri Mendeleev, the creator of the Periodic Table.

Health Effects

The International Commission on Radiological Protection has set annual exposure limits for the most stable isotope. For mendelevium-258, the ingestion limit was set at 9×10⁵ becquerels (1 Bq = 1 decay per second), and given the half-life of this isotope, this is only 2.48 ng (nanograms). The inhalation limit is at 6000 Bq or 16.5 pg (picogram).

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