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Also known as Md, element 101, Unu, unnilunium, 101Md, Mv

Mendelevium is a synthetic chemical element; it has symbol Md (formerly Mv) and atomic number 101. A metallic radioactive transuranium element in the actinide series, it is the first element by atomic number that currently cannot be produced in macroscopic quantities by neutron bombardment of lighter elements. It is the thirteenth actinide, the ninth transuranic element, and the first transfermium; it is named after Dmitri Mendeleev, the father of the periodic table.

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Mendelevium is a synthetic element created in laboratories with atomic number 101 that exists only in microscopic amounts and belongs to the actinide series of the periodic table. It is notable as the first element that cannot be made in practical quantities through standard nuclear bombardment methods, and it was named after Dmitri Mendeleev in honor of his pioneering work organizing the periodic table.

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