Meitnerium Mt (Element 109) of Periodic Table

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 – 282_Mt 278_mt 276_Mt 274_Mt

Uses – At present it is only used in research.

Natural abundance – It is made by bombarding bismuth with iron atoms

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