atomic_number: 34
symbol: Se
name: Selenium
category: Nonmetal
category_label: Non metal
period: 4
group: 16
group_label: 16 VIA
block: p
grid_row: 4
grid_col: 16
phase: solid
lab_made: false
radioactive_marker: false
is_radioactive: false
atomic_mass: '78.971'
atomic_mass_value: 78.971
atomic_mass_most_stable_isotope: false
oxidation_states: 6 *4* -2
oxidation_states_parsed:
- state: '6'
  common: false
- state: '4'
  common: true
- state: '-2'
  common: false
ionization_energy: '9.752'
ionization_energy_ev: 9.752
electron_configuration: '[Ar] 3d^{10}4s^{2}4p^{4}'
electron_configuration_formatted: '[Ar]3d¹⁰4s²4p⁴'
electron_configuration_html: '[Ar]3d<sup>10</sup>4s<sup>2</sup>4p<sup>4</sup>'
atomic_radius: '1.9'
atomic_radius_angstrom: 1.9
electron_affinity: '2.021'
electron_affinity_ev: 2.021
rsc_url: https://www.rsc.org/periodic-table/element/34/selenium