Question

calcium, magnesium, and strontium are near each other on the periodic table and have some characteristics in common, but they differ in chemical reactivity. which lists these metals in order from most reactive to least reactive?
calcium, magnesium, strontium
magnesium, calcium, strontium
strontium, calcium, magnesium
strontium, magnesium, calcium

Explanation:

These metals (calcium, magnesium, strontium) are alkaline earth metals. In the periodic table, for alkaline earth metals, reactivity increases as we move down the group. Strontium is below calcium, and calcium is below magnesium in Group 2. So the order from most reactive to least reactive is strontium, calcium, magnesium.

Answer:

strontium, calcium, magnesium (the third option: strontium, calcium, magnesium)