atomic_number: 89
symbol: Ac
name: Actinium
category: Actinide
category_label: Actinide
period: 7
group: 3
group_label: 3 IIIA
block: f
grid_row: 10
grid_col: 4
phase: solid
lab_made: false
radioactive_marker: false
is_radioactive: true
atomic_mass: '[227]'
atomic_mass_value: 227.0
atomic_mass_most_stable_isotope: true
oxidation_states: '*3*'
oxidation_states_parsed:
- state: '3'
  common: true
ionization_energy: '5.17'
ionization_energy_ev: 5.17
electron_configuration: '[Rn] 6d^{1}7s^{2}'
electron_configuration_formatted: '[Rn]6d¹7s²'
electron_configuration_html: '[Rn]6d<sup>1</sup>7s<sup>2</sup>'
atomic_radius: '2.47'
atomic_radius_angstrom: 2.47
electron_affinity: '0.35'
electron_affinity_ev: 0.35
rsc_url: https://www.rsc.org/periodic-table/element/89/actinium