Question

Which of the following stays unaltered on moving down a group?

• A. Number of shells
• B. Number of nucleons
• C. Density
• D. Valence electrons

Answer 1

The correct option is D

Valence electrons

• Number of shells, nucleons and density increase in the elements while going down the group.
• Number of valence electrons remain the same in all the elements while going down the group.
• Hence, valence electrons is the correct answer.