Which of the following alkaline earth metals is the least reactive? (2022)

Which of the following alkaline earth metals is the least reactive? (2022)

Step 1: Understand what alkaline earth metals are. They are a group of elements in the second column of the periodic table, including Beryllium (Be), Magnesium (Mg), Calcium (Ca), Strontium (Sr), Barium (Ba), and Radium (Ra).
Step 2: Know that reactivity in metals generally increases as you move down the group in the periodic table.
Step 3: Recognize that Magnesium (Mg) is higher up in the group compared to the other alkaline earth metals.
Step 4: Learn about ionization energy, which is the energy required to remove an electron from an atom. Higher ionization energy means the element is less likely to react.
Step 5: Compare the ionization energies of the alkaline earth metals. Magnesium has a higher ionization energy than Calcium, Strontium, Barium, and Radium.
Step 6: Conclude that since Magnesium has the highest ionization energy among the alkaline earth metals, it is the least reactive.

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