Question

Describe the trends in atomic radii by checking the correct box.

Atomic radii from the left to right across a period tend to:

increase.

decrease.
Atomic radii from the top to the bottom of a group tend to:

increase.

decrease.

Answer 1

Atomic radii from the left to right across a period tend to:
- increase.
- ✅ decrease.

Explanation: Nuclear charge increases across a period, pulling electrons closer and reducing atomic size.

Atomic radii from the top to the bottom of a group tend to:
- ✅ increase.
- decrease.

Explanation: Additional electron shells are added down a group, increasing the atomic size despite greater nuclear charge.