Question

use the periodic table to identify the number of core electrons and the number of valence elec each case below. potassium (k): 1s²2s²2p⁶3s²3p⁶4s¹ core electrons valence electrons

Explanation:

Step1: Calculate core electrons

Core electrons are all electrons except valence electrons. For potassium (K) with electron configuration \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1}\), sum the non - \(4s\) electrons: \(2 + 2+6 + 2+6=18\).

Step2: Calculate valence electrons

Valence electrons are in the outermost shell. For K, the outermost shell is \(n = 4\), and there is \(1\) electron in \(4s\).

Answer:

core electrons: \(18\)
valence electrons: \(1\)