Properties

Atomic Number	101
CAS Registry Number	11/01/40
Chemical Symbol	Md

History

The atomic number is 101 and the chemical symbol is Md. The original chemical symbol proposed was My but this was changed in 1955. The element name derives from the Russian chemist Dimitrii Mendeleev who developed the Periodic Table of the chemical elements. Credit for the first synthesis of this element is given American chemists at the University of California lab in Berkeley California under Glenn T. Seaborg in 1958 who used the nuclear reaction 253Es( 4He 2n) 255Md and the nuclear reaction 253Es ( 4He n) 256Md. The longest half-life associated with this unstable element is 51 day 258Md.

Holden, Norman E., (2004). History of the origin of the chemical elements and their discoverers. National Nuclear Data Center. Retrieved from http://www.nndc.bnl.gov/content/elements.html