Which configuration is possible in an excited state of electron?

In an excited state, an electron occupies a higher energy level than its ground state configuration. For example, in a hydrogen atom, instead of being in the 1s orbital (ground state), an electron might be promoted to the 2s or 2p orbital. This results in a configuration where one or more electrons have absorbed energy and moved to a higher principal energy level, while other electrons remain in their original levels. The specific excited state configuration will depend on the atom and the amount of energy absorbed.