Question

Which is correct?
a. Gallium is the most reactive because it has the most neutrons.***
b. Silicon is the most reactive because it is a metalloid.
c. Fluorine is the most reactive because it has 7 valence electrons.
d. Boron is the most reactive because Boron has the least amount of protons.

Answer 1

You don't tell us what this is about. Is this an experiment. Then tell us the details. Is this a question from a text? What's the rest of the question?

Answer 2

the question doesn't say anything else

Answer 3

Then the secret is in what chapter you are studying. It may be electronegativity and how that affects the reactivity. Or it may be about the reactivity of elements in the periodic table. Whatever chapter it is, my best guess is that the most reactive element is F but it isn't because it has 7 electrons. F is the most active element in the periodic table because it has the highest electronegativity of all of the elements. I might point out the F, Cl, Br, I, At all have seven valence electrons so the seven valence electrons isn't the reason for F being the most reactive.