atomic_number: 100
symbol: Fm
name: Fermium
category: Actinide
category_label: Actinide
period: 7
group: null
group_label: Actinide
block: f
grid_row: 10
grid_col: 15
phase: solid
lab_made: true
radioactive_marker: false
is_radioactive: true
atomic_mass: '[257]'
atomic_mass_value: 257.0
atomic_mass_most_stable_isotope: true
oxidation_states: '*3*'
oxidation_states_parsed:
- state: '3'
  common: true
ionization_energy: '6.5'
ionization_energy_ev: 6.5
electron_configuration: '[Rn] 5f^{12}7s^{2}'
electron_configuration_formatted: '[Rn]5f¹²7s²'
electron_configuration_html: '[Rn]5f<sup>12</sup>7s<sup>2</sup>'
atomic_radius: '2.45'
atomic_radius_angstrom: 2.45
electron_affinity: U
electron_affinity_ev: null
rsc_url: https://www.rsc.org/periodic-table/element/100/fermium