Question

Which of the following elements in the periodic table are considered as metalloids? A. P B. As C. Si D. S E. Ge

• A. A, D and E only
• B. A, B and E only
• C. A, C and E only
• D. B, C and E only

Hint:

Metalloids lie along the staircase in the periodic table: B, Si, Ge, As, Sb, Te, Po, At.

Answer 1

The Correct Option is D

Step 1: Concept
Metalloids are elements with properties intermediate between metals and nonmetals.

Step 2: Meaning
They are located along the staircase line in the periodic table, and include: B, Si, Ge, As, Sb, Te, Po, At.

Step 3: Analysis
P (A): Nonmetal --- not a metalloid.
As (B): Metalloid --- located on the staircase.
Si (C): Metalloid --- classic semiconductor.
S (D): Nonmetal --- not a metalloid.
Ge (E): Metalloid --- semiconductor used in electronics.

Step 4: Conclusion
As (B), Si (C), and Ge (E) are metalloids. Final Answer: (D)