109 Mt (Meitnerium)
Mass number – 278
Atomic number (Z) – 109
Atomic weight – 268 g/mol
Electrons: 109
Protons: 109
Neutrons: 169
Group – 9
Period – 7
Block – d
Element category – Transition metal
Appearance – Highly radioactive metal
Half Life(s) – 1800
Lifetime (s) – 2600
Electron per shell – K2, L8, M18, N32, O32, P15, Q2
Electron configuration – 1s22s22p63s23p63d104s24p64d105s25p64f145d106s26p65f146d77s2
Phase – solid
Density – 37.4 g/cm3
Oxidation states – 9, 8, 6, 4, 3, 1
Ionization energies – 1st: 800.8 kJ/mol, 2nd: 1823.6 kJ/mol, 3rd: 2904.2 kJ/mol
Atomic radius – 128 pm
Covalent radius – 129
Crystal structure – Face-centered cubic
Magnetic ordering – Paramagnetic
CAS Number – 54038-01-6
Naming – After Lise Meitner
Discovery – GSI Helmholtz Centre for Heavy Ion Research in Darmstadt, Germany (1982)
Isotopes – 282Mt 278mt 276Mt 274Mt
Uses – At present it is only used in research.
Natural abundance – It is made by bombarding bismuth with iron atoms
#Meitnerium