use the periodic table to identify the number of core electrons and the number of valence electrons in each…

use the periodic table to identify the number of core electrons and the number of valence electrons in each case below. potassium (k): 1s²2s²2p⁶3s²3p⁶4s¹ 18 core electrons 1 valence electrons complete iron (fe): ar4s²3d⁶ core electrons valence electrons done

use the periodic table to identify the number of core electrons and the number of valence electrons in each case below. potassium (k): 1s²2s²2p⁶3s²3p⁶4s¹ 18 core electrons 1 valence electrons complete iron (fe): ar4s²3d⁶ core electrons valence electrons done

Answer

Explanation:

Step1: Recall noble - gas electron configuration

The electron configuration of argon (Ar) is $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}$, which has 18 electrons.

Step2: Determine core electrons for iron

For iron (Fe) with electron - configuration $[Ar]4s^{2}3d^{6}$, the core electrons are the electrons in the argon - like inner shell. So the number of core electrons is 18.

Step3: Determine valence electrons for iron

The valence electrons are the electrons in the outermost shell. For Fe, the outermost shell electrons are in the 4s and 3d orbitals. The 4s sub - shell has 2 electrons and the 3d sub - shell has 6 electrons. So the number of valence electrons is $2 + 6=8$.

Answer:

core electrons: 18 valence electrons: 8