c. Yes, because the reactivity of elements decreases as their atomic numbers decrease.
Javier's arrangement is correct because the reactivity of elements generally decreases as their atomic numbers decrease. In this case, carbon (C) has the highest atomic number (6) and is the least reactive, while potassium (K) has the lowest atomic number (19) and is the most reactive.
Javier's teacher gives him four cards, each displaying information about an element, and asks him to put them in order of reactivity. The elements are carbon (C), helium (He), magnesium (Mg), and potassium (K). Javier arranges the elements in order from most reactive to least reactive, as shown in the diagram.
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Is Javier's arrangement correct? Why or why not?
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a
No, because the reactivity of elements decreases from right to left on the periodic table.
b
No, because the reactivity of elements decreases as their atomic masses increase.
c
Yes, because the reactivity of elements decreases as their atomic numbers decrease.
d
Yes, because the reactivity of elements decreases from left to right on the periodic table.
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