Question

question 35
1 pts
which of the following is the shorthand electron configuration for fe:
kr 5s²
ne 3s² 3p²
ne 3s² 3p³
ar 4s² 3d⁶
ar 4s² 3d¹⁰ 4p¹

Explanation:

Iron (Fe) has an atomic number of 26. The shorthand electron - configuration uses the noble - gas core of the previous noble gas. Argon (Ar) is the previous noble gas with an atomic number of 18. After the argon core, the remaining 8 electrons are filled in the 4s and 3d orbitals. The 4s orbital fills first with 2 electrons, and then the 3d orbital gets 6 electrons.

Answer:

[Ar] 4s² 3d⁶