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Which of the following elements is a metalloid? A) Na B) Si C) Cu D) Al

easy MCQ 1 mark Class 11 · Chemistry · Classification of Elements and Periodicity in Properties
  1. A) Na
  2. B) Si
  3. C) Cu
  4. D) Al
Answer
B) Si

The correct answer is B) Si — Thus Si is the metalloid.

Step-by-step solution

  1. Recall that a metalloid has properties intermediate between metals and nonmetals.
  2. Identify the elements: Na is a metal, Cu is a metal, Al is a metal, Si has intermediate properties such as high melting point and semi‑conductivity.
  3. Thus Si is the metalloid.
Common mistake: Confusing silicon with a metal due to its conductivity

Concept tested: Identify metalloid

Published · How this solution was prepared and checked

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