Question

what is the electron configuration of cs?

Explanation:

Step1: Determine the atomic number of Cs

Cesium (Cs) has an atomic number of 55.

Step2: Use the Aufbau principle

Electrons fill orbitals in the order of increasing energy: \(1s < 2s < 2p < 3s < 3p < 4s < 3d < 4p < 5s < 4d < 5p < 6s < 4f < 5d < 6p\) etc.
The number of electrons in each orbital: \(s\)-orbitals can hold 2 electrons, \(p\)-orbitals can hold 6 electrons, \(d\)-orbitals can hold 10 electrons, \(f\)-orbitals can hold 14 electrons.
Fill the orbitals until we reach 55 electrons.
\(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}5s^{2}4d^{10}5p^{6}6s^{1}\)

Answer:

\(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}5s^{2}4d^{10}5p^{6}6s^{1}\)