The first electron removed in the formation of iron cation is removed from a 4s orbital whose set of quantum numbers (n, l, ml) are 4, 0, 0 respectively.
The term quantum numbers refers to the numbers that are used to show the position of an electron in an atom. There are four sets of quantum numbers;
The electron configuration of iron is written as; [Ar] 3d6 4s2, the first electron removed in the formation of iron cation is removed from a 4s orbital whose set of quantum numbers (n, l, ml) are 4, 0, 0 respectively.
Learn more about quantum numbers: https://brainly.com/question/4732783
