Question

Which element behaves chemically both as a metal and as a non-metal (a metalloid)?

• A. Boron
• B. Argon
• C. Carbon
• D. Xenon

Hint:

This element sits along the "staircase" line separating metals from non-metals.

Answer 1

The Correct Option is A

Step 1: Recall what a metalloid is.
A metalloid is an element that shows some physical and chemical properties of metals and some properties of non-metals.
Step 2: Identify boron's position.
Boron lies at the border between metals and non-metals in the periodic table. It has a shiny appearance somewhat like a metal, yet its oxide, B₂O₃, is acidic like a non-metal oxide, and it is a poor conductor compared to true metals.
Step 3: Rule out the other options.
Argon and xenon are noble gases, they are chemically inert and do not show metallic behaviour at all. Carbon is a typical non-metal, it does not display metallic character.
Final Answer: A) Boron.