Which of these is an alkali metal?

Answer and explanation

Correct answer: C. Potassium

  1. Step 1: Alkali metals are the chemical elements belonging to Group 1 of the periodic table (excluding hydrogen): lithium (), sodium (), potassium (), rubidium (), caesium (), and francium ().
  2. Step 2: Among the given options, potassium () is located in Group 1 with a single valence electron ().
  3. Step 3: The other choices belong to alkaline earth metals or transition metals.
Answer
Potassium.
Why not the others: Calcium and Magnesium are Group 2 alkaline earth metals; Aluminium is a Group 13 post-transition metal.

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