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 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 core electrons valence electrons done

Answer

Explanation:

Step1: Define core and valence electrons

Core electrons are in inner - shells, valence electrons are in outermost shell.

Step2: Identify electron configuration shells

For potassium (K) with electron configuration $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1}$, the inner - shell electrons are $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}$ and the outer - shell electron is $4s^{1}$.

Step3: Calculate number of core electrons

Count electrons in inner - shells: $2 + 2+6 + 2+6=18$.

Step4: Calculate number of valence electrons

The outermost shell has 1 electron in $4s^{1}$.

Answer:

core electrons: 18 valence electrons: 1