atomic_number: 109
symbol: Mt
name: Meitnerium
category: Unknown
category_label: Unknown properties
period: 7
group: 9
group_label: 9 VIIIB
block: d
grid_row: 7
grid_col: 9
phase: unknown
lab_made: true
radioactive_marker: false
is_radioactive: true
atomic_mass: '[278]'
atomic_mass_value: 278.0
atomic_mass_most_stable_isotope: true
oxidation_states: U
oxidation_states_parsed: []
ionization_energy: U
ionization_energy_ev: null
electron_configuration: '[Rn] 5f^{14}6d^{7}7s^{2}'
electron_configuration_formatted: '[Rn]5f¹⁴6d⁷7s²'
electron_configuration_html: '[Rn]5f<sup>14</sup>6d<sup>7</sup>7s<sup>2</sup>'
atomic_radius: U
atomic_radius_angstrom: null
electron_affinity: U
electron_affinity_ev: null
rsc_url: https://www.rsc.org/periodic-table/element/109/meitnerium