Which of these elements is in the same group as sodium?
Answer and explanation
Correct answer: C. Potassium
Sodium and potassium both have one outer electron, so they are Group 1 alkali metals.
Answer: Potassium.
Why not the others: Magnesium: it is in Group 2. Calcium: it is in Group 2. Chlorine: it is in Group 17.
Answer: Potassium.
Why not the others: Magnesium: it is in Group 2. Calcium: it is in Group 2. Chlorine: it is in Group 17.
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