Which of the following is the lightest alkaline earth metal? (2019)

Which of the following is the lightest alkaline earth metal? (2019)

Step 1: Understand what alkaline earth metals are. They are a group of elements in the periodic table that include beryllium, magnesium, calcium, strontium, barium, and radium.
Step 2: Identify the atomic weights of the alkaline earth metals. Beryllium (Be) has an atomic weight of about 9.0122, magnesium (Mg) is about 24.305, calcium (Ca) is about 40.078, strontium (Sr) is about 87.62, barium (Ba) is about 137.33, and radium (Ra) is about 226.
Step 3: Compare the atomic weights. The atomic weight of beryllium is the smallest among all the alkaline earth metals.
Step 4: Conclude that since beryllium has the lowest atomic weight, it is the lightest alkaline earth metal.

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