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.\npotassium (k): 1s²2s²2p⁶3s²3p⁶4s¹\nargon (ar): ne3s²3p⁶\n18 √ core electrons\n1 √ valence electrons\ncomplete\n10 √ core electrons\n8 √ valence electrons\ncomplete\niron (fe): ar4s²3d⁶\nmagnesium (mg): 1s²2s²2p⁶3s²\n18 √ core electrons\n8 √ valence electrons\ncomplete\ncore electrons\nvalence electrons\ndone √

use the periodic table to identify the number of core electrons and the number of valence electrons in each case below.\npotassium (k): 1s²2s²2p⁶3s²3p⁶4s¹\nargon (ar): ne3s²3p⁶\n18 √ core electrons\n1 √ valence electrons\ncomplete\n10 √ core electrons\n8 √ valence electrons\ncomplete\niron (fe): ar4s²3d⁶\nmagnesium (mg): 1s²2s²2p⁶3s²\n18 √ core electrons\n8 √ valence electrons\ncomplete\ncore electrons\nvalence electrons\ndone √

Answer

Explanation:

Step1: Recall electron - configuration rules

Core electrons are inner - shell electrons, and valence electrons are outer - shell electrons.

Step2: Analyze magnesium's electron configuration

Magnesium (Mg) has an electron configuration of $1s^{2}2s^{2}2p^{6}3s^{2}$. The noble - gas core equivalent to neon is $1s^{2}2s^{2}2p^{6}$, which has 10 electrons. These are the core electrons.

Step3: Determine valence electrons

The electrons in the outermost shell (n = 3 for Mg) are the valence electrons. In the $3s^{2}$ sub - shell, there are 2 valence electrons.

Answer:

10 core electrons 2 valence electrons