Rubidium (Rb) — its atomic orbitalsRubidium is element 37: period 5, group 1, alkali metal of the s block. Its ground-state configuration is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 5s¹, so its outermost occupied shell is n = 5 and holds 1 electron.Each orbital below is the hydrogen-like solution at the effective nuclear charge Slater's rules give its subshell, so its radial nodes and its angular nodes fall where the wavefunction changes sign rather than where a drawing puts them. Slater screening gives the effective charge; the energy is the hydrogen-like −13.606 Z_eff²/n², and ⟨r⟩ the mean radius of one orbital of the subshell.

Subshell

Electrons

Z_eff

Energy (eV)

Radial nodes

Angular nodes

⟨r⟩ (Å)

36.70

-18325.37

0.022

32.85

-3670.55

0.097

32.85

-3670.55

0.081

25.75

-1002.38

0.277

25.75

-1002.38

0.257

9.25

-72.76

1.373

15.85

-379.78

0.351

9.25

-72.76

1.316

2.20

-2.63

9.020

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