Question

18 core electrons 1 valence electrons iron (fe): ar4s²3d⁶ core electrons valence electrons argon (ar): ne3s²3p⁶ core electrons valence electrons

Explanation:

Step1: Determine core electrons of Fe

Argon has 18 electrons. Iron's electron - configuration is [Ar]4s²3d⁶. The core electrons are the electrons in the argon - like inner shell, so there are 18 core electrons.

Step2: Determine valence electrons of Fe

The valence electrons are in the outermost shell. For Fe with [Ar]4s²3d⁶, the 4s and 3d electrons are considered valence electrons. 2 (from 4s) + 6 (from 3d) = 8 valence electrons.

Step3: Determine core electrons of Ar

Neon has 10 electrons. Argon's electron - configuration is [Ne]3s²3p⁶. The core electrons are the electrons in the neon - like inner shell, so there are 10 core electrons.

Step4: Determine valence electrons of Ar

The electrons in the 3s and 3p orbitals are the valence electrons for Ar. 2 (from 3s) + 6 (from 3p) = 8 valence electrons.

Answer:

Iron (Fe):
core electrons: 18
valence electrons: 8
Argon (Ar):
core electrons: 10
valence electrons: 8