Rb (Rubidium) is an element with position number 37 in the periodic table.
Located in the V period. Melting point: 39 ℃. Density: 1.53 g/cm^{3}.

Electronic configuration of the Rubidium atom in ascending order of orbital energies: 1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{2} 3d^{10} 4p^{6} 5s^{1}

Electronic configuration of the Rubidium atom in ascending order of the levels: 1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 3d^{10} 4s^{2} 4p^{6} 5s^{1}

Reduced electronic configuration Rb: [Kr] 5s^{1}

Below is the electronic diagram of the Rubidium atom
Distribution of electrons over energy levels in the Rb atom 1-st level (K): 2 2-st level (L): 8 3-st level (M): 18 4-st level (N): 8 5-st level (O): 1

Valence electrons of Rubidium

The number of valence electrons in a Rubidium atom - 1.
Below are their quantum numbers (N - energy, L - angular momentum, M - magnetic moment, S - spin )