Ground States and Ionization Energies: K

NIST Atomic Spectroscopic Database

Ground States and Ionization Energies: K

Potassium, Z = 19

K I

K I isoelectronic sequence

Ground state 1s²2s²2p⁶3s²3p⁶4s ²S_1/2

Ionization energy 35009.814 ± .0007 cm^-¹

References on Energy Levels

K II

Ar I isoelectronic sequence

Ground state 1s²2s²2p⁶3s²3p⁶ ¹S₀

Ionization energy 255100 ± 300 cm^-¹

References on Energy Levels

K III

Cl I isoelectronic sequence

Ground state 1s²2s²2p⁶3s²3p⁵ ²Pº_3/2

Ionization energy 369450 ± 100 cm^-¹

References on Energy Levels

K IV

S I isoelectronic sequence

Ground state 1s²2s²2p⁶3s²3p⁴ ³P₂

Ionization energy 491300 ± 400 cm^-¹

References on Energy Levels

K V

P I isoelectronic sequence

Ground state 1s²2s²2p⁶3s²3p³ ⁴Sº_3/2

Ionization energy 666700 ± 1300 cm^-¹

References on Energy Levels

K VI

Si I isoelectronic sequence

Ground state 1s²2s²2p⁶3s²3p² ³P₀

Ionization energy 802000 ± 1600 cm^-¹

References on Energy Levels

K VII

Al I isoelectronic sequence

Ground state 1s²2s²2p⁶3s²3p ²Pº_1/2

Ionization energy 948200 ± 900 cm^-¹

References on Energy Levels

K VIII

Mg I isoelectronic sequence

Ground state 1s²2s²2p⁶3s² ¹S₀

Ionization energy 1249200 ± 400 cm^-¹

References on Energy Levels

K IX

Na I isoelectronic sequence

Ground state 1s²2s²2p⁶3s ²S_1/2

Ionization energy 1418063 ± 20 cm^-¹

References on Energy Levels

K X

Ne I isoelectronic sequence

Ground state 1s²2s²2p⁶ ¹S₀

Ionization energy 4063000 ± 5000 cm^-¹

References on Energy Levels

K XI

F I isoelectronic sequence

Ground state 1s²2s²2p⁵ ²Pº_3/2

Ionization energy 4555000 ± 9000 cm^-¹

References on Energy Levels

K XII

O I isoelectronic sequence

Ground state 1s²2s²2p⁴ ³P₂

Ionization energy 5077000 ± 10000 cm^-¹

References on Energy Levels

K XIII

N I isoelectronic sequence

Ground state 1s²2s²2p³ ⁴Sº_3/2

Ionization energy 5764000 ± 12000 cm^-¹

References on Energy Levels

K XIV

C I isoelectronic sequence

Ground state 1s²2s²2p² ³P₀

Ionization energy 6345000 ± 13000 cm^-¹

References on Energy Levels

K XV

B I isoelectronic sequence

Ground state 1s²2s²2p ²Pº_1/2

Ionization energy 6945000 ± 14000 cm^-¹

References on Energy Levels

K XVI

Be I isoelectronic sequence

Ground state 1s²2s² ¹S₀

Ionization energy 7810000 ± 16000 cm^-¹

References on Energy Levels

K XVII

Li I isoelectronic sequence

Ground state 1s²2s ²S_1/2

Ionization energy 8344200 ± 1000 cm^-¹

References on Energy Levels

K XVIII

He I isoelectronic sequence

Ground state 1s² ¹S₀

Ionization energy 37188200 ± 4610.8 cm^-¹

References on Energy Levels

K XIX

H I isoelectronic sequence

Ground state 1s ²S_1/2

Ionization energy 39795750 ± 4934.084 cm^-¹

References on Energy Levels

NIST Physics Laboratory