5.The order of decreasing ionization energy is F, N, P. As you move from the left to the right on the periodic table the ionization energy increases, and it decreases when you move down the periodic table. Therefore, Fluorine (F) is the farthest to the right of the three elements, making it have the highest ionization energy. Considering Nitrogen (N) is above Phosphorus (P), it has a higher ionization energy. Overall, Phosphorus (P) has the lowest ionization energy of the three elements.6.The order of decreasing electronegativity is F, Cl, Al. When you move down the periodic table the electronegativity decreases, and when you go from left to right on the periodic table it increases. Considering their position on the periodic table, Fluorine (F) is above Chlorine (Cl), making Fluorine (F) highest with Chlorine (Cl) being second. Finally, Aluminum (Al) is the farthest to the right of the three elements, resulting in it having the least amount of electronegativity.7.The order of decreasing chemical reactivity is Rb, Na, Mg. The chemical reactivity decreases as you go from left to right and increases as you go down the periodic table.
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