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)

Explanation:

Atomic radius increases down a group (more electron shells) and decreases across a period (increasing nuclear charge pulls electrons closer). Silicon (Si) is in period 3, group 14.

• Aluminum (Al) is in period 3, group 13: to the left of Si, so larger radius.
• Carbon (C) is in period 2, group 14: above Si, so smaller radius.
• Sulfur (S) is in period 3, group 16: to the right of Si, so smaller radius.
• Tin (Sn) is in period 5, group 14: below Si, so larger radius.

Answer:

aluminum (Al)
tin (Sn)