Which one of the following is a metalloid?

Correct option is D

The correct answer is (d) As (Arsenic)

Metalloids are elements that exhibit properties of both metals and non-metals. They typically have intermediate electrical conductivity, making them useful in semiconductors.

Arsenic (As) is a metalloid because:

• It has a metallic luster but is brittle like a non-metal.
• It can conduct electricity but not as well as metals.

Additional Information:

• Na (Sodium):
  A metal; highly reactive alkali metal.
• Fe (Iron):
  A metal commonly used for its strength and conductivity.
• Cu (Copper):
  A metal; excellent conductor of electricity and heat.

Metalloids:

Other examples of metalloids include:

• Boron (B)
• Silicon (Si)
• Germanium (Ge)
• Antimony (Sb)
• Tellurium (Te)