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.
done

Explanation:

Across a period, increasing nuclear charge pulls electrons closer, shrinking atomic radii. Down a group, new electron shells are added, increasing atomic radii.

Answer:

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

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