Question

Which of the following statements is true?

• A. The atomic radius of Ga is more than Al.
• B. The atomic radius of Ga is equal to Al.
• C. The atomic radius of Ga is less than B.
• D. The atomic radius of Ga is less than Al.

Answer 1

The correct option is D

The atomic radius of Ga is less than Al.

The presence of additional 10 -electrons offer only poor screening effect for the outer electrons from the increased nuclear charge in gallium hence the atomic radius of Ga is less than Al.