Question

The atomic radius increases as we move down a group because:

• A. atomic mass decreases
• B. atomic number decreases
• C. atomic number increases
• D. number of shell increases

Answer 1

Answer: (C), (D)

The correct options are
C atomic number increases
D number of shell increases

Atomic radius is the distance between the center of the nucleus to the outermost shell of an atom.

As we move down a group, the atomic number increases causing the number of electrons and shells to increase. This results in an increase in atomic radius down the group.