atomic_number: 93
symbol: Np
name: Neptunium
category: Actinide
category_label: Actinide
period: 7
group: null
group_label: Actinide
block: f
grid_row: 10
grid_col: 8
phase: solid
lab_made: true
radioactive_marker: false
is_radioactive: true
atomic_mass: '[237]'
atomic_mass_value: 237.0
atomic_mass_most_stable_isotope: true
oxidation_states: 6 *5* 4 3
oxidation_states_parsed:
- state: '6'
  common: false
- state: '5'
  common: true
- state: '4'
  common: false
- state: '3'
  common: false
ionization_energy: '6.266'
ionization_energy_ev: 6.266
electron_configuration: '[Rn] 5f^{4}6d^{1}7s^{2}'
electron_configuration_formatted: '[Rn]5f⁴6d¹7s²'
electron_configuration_html: '[Rn]5f<sup>4</sup>6d<sup>1</sup>7s<sup>2</sup>'
atomic_radius: '2.39'
atomic_radius_angstrom: 2.39
electron_affinity: U
electron_affinity_ev: null
rsc_url: https://www.rsc.org/periodic-table/element/93/neptunium