Question

Use the periodic table to determine which elements are likely to have a larger atomic radius than silicon (Si). Check all that apply.

aluminum (Al)

carbon (C)

sulfur (S)

tin (Sn)

Answer 1

Aluminum (Al) and tin (Sn).

Reason: atomic radius increases down a group and decreases across a period. Al is left of Si in the same period (so larger), and Sn is below Si in the same group (so larger). Carbon (above Si) and sulfur (to the right of Si) are smaller.