Discovered By: Albert Ghiorso, Glenn Seaborg
Discovery year: 1955

The following table showing some properties of Mendelevium(Md):

Table Example
Atomic number 101
Group n/a
Period 7
Block f
Electrons 101
Protons 101
Neutrons 157
Atomic weight (258)
Oxidation states +2, +3
Ionic charge Md^2+, Md^3+


Table Example
Electrons per shell K2 L8 M18 N32 O31 P8 Q2
Electron configuration 1s^2 2s^2 2p66 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2 4d^10 5p^6 6s^2 4f^14 5d^10 6p^6 7s^2 5f^13
Melting point 827°C
Electronegativity 1.3
Valence 3
First ionization energy 635 kJ.mol^-1
Radioactive Yes
Half life 4.45*10^6 s
life time 6.42*10^6 s
Decay mode Alpha emission (α-decay)