Respuesta :
Both models are effective because they show the valence electrons, and these valence electrons indicate the reactivity of an element.
Answer : Option D) Both the models because each shows an electron in the outermost shell.
Explanation : It is clearly seen that the model 1 and model 2 has the electronic configuration which is same for potassium.
The reactivity in potassium is seen because of the one electron present in the outermost valence shell.
The electronic configuration of potassium is [tex] 1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1} [/tex]
Therefore, both the models are able to show the reactivity of the potassium. Hence, the answer is option D.