Is 1s2 2s2 2p6 3s2 3p6 4s2 4d10 4p5 valid?

Answer 1

Bromine

Answer 2

No, the electron configuration provided is not valid. The electron configuration should follow the Aufbau principle, which states that electrons fill orbitals starting from the lowest energy level to the highest. In this case, the electron configuration should end with 4p6 instead of 4p5 to fill the 4th energy level completely before moving on to the 5th energy level.

Answer 3

No, this electron configuration is not valid. The last orbital should only have a maximum of 2 electrons according to the Pauli exclusion principle. The correct configuration for this element with 53 electrons would be 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s1.

Answer 4

yes