Question

On moving top to down in a group. the atomic density:

• A. Decreases
• B. Remains the same
• C. Can't be said
• D. Generally increases

Answer 1

The correct option is D Generally increases

In a group on moving top to down the atomic density generally increases.
On moving down the group, both mass and volume increase. But the increase in the mass is more than the increase in the volume due to increase in the effective nuclear charge (which in turn is due to poor shielding by inner electrons).