Is calcium strontium beryllium or magnesium more reactive?

Among calcium, strontium, beryllium, and magnesium, strontium is the most reactive. Reactivity generally increases down a group in the Periodic Table, and strontium is below calcium. Beryllium, being a group 2 alkaline earth metal, is less reactive than the other three. Therefore, in order of increasing reactivity, it would be beryllium, magnesium, calcium, and then strontium.