Question:

Which of the following is not an alkali metal?

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Group 1 elements are alkali metals, while Group 2 elements are alkaline earth metals.
Updated On: May 14, 2026
  • Lithium
  • Potassium
  • Beryllium
  • Caesium
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The Correct Option is C

Solution and Explanation

Concept:
Alkali metals belong to Group 1 of the periodic table. They are: \[ \text{Li},\ \text{Na},\ \text{K},\ \text{Rb},\ \text{Cs},\ \text{Fr} \]

Step 1:
Check the given elements.

• Lithium is an alkali metal.
• Potassium is an alkali metal.
• Caesium is an alkali metal.
• Beryllium belongs to Group 2, so it is an alkaline earth metal. Hence, the correct answer is:
\[ \boxed{(C)\ \text{Beryllium}} \]
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