What is the spectroscopic notation of iron?

The spectroscopic notation of iron, specifically for its ground state, is written as ( \text{[Ar]} , 3d^6 , 4s^2 ). This indicates that iron has 26 electrons, with the electron configuration consisting of two electrons in the 4s subshell and six electrons in the 3d subshell, following the argon core. The notation helps in understanding the electron distribution and the chemical properties of iron.