Which of the following elements is a member of the alkali metals? (2020)

Which of the following elements is a member of the alkali metals? (2020)

Step 1: Understand what alkali metals are. Alkali metals are a group of elements in the periodic table found in Group 1.
Step 2: Identify the elements listed in the question: Sodium (Na), Magnesium (Mg), Calcium (Ca), and Barium (Ba).
Step 3: Check which of these elements is in Group 1 of the periodic table. Sodium (Na) is in Group 1.
Step 4: Recognize that Magnesium (Mg), Calcium (Ca), and Barium (Ba) are in Group 2, which means they are alkaline earth metals.
Step 5: Conclude that Sodium (Na) is the only alkali metal among the options given.

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