Question

review progress
use the figure to answer questions 10 and 11.
first 3 elements of group 6a of the periodic table.
investigation test: the periodic table (lms graded)
which of the elements have atomic radii smaller than s?
a. ar
b. cl
c. na
d. o
e. p
question 9 of 15
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Explanation:

Step1: Recall atomic - radius trend

Atomic radius decreases across a period from left - to - right and increases down a group in the periodic table. Sulfur (S) is in Group 16 and Period 3.

Step2: Analyze each option

• Option A: Argon (Ar) is in Period 3, Group 18. It has a smaller atomic radius than S because as we move from left - to - right across Period 3, the effective nuclear charge increases, pulling the electrons closer to the nucleus.
• Option B: Chlorine (Cl) is in Period 3, Group 17. It has a smaller atomic radius than S as it is to the right of S in the same period.
• Option C: Sodium (Na) is in Period 3, Group 1. It has a larger atomic radius than S as it is to the left of S in the same period.
• Option D: Oxygen (O) is in Group 16, Period 2. It has a smaller atomic radius than S because it is in a higher period (with fewer electron shells).
• Option E: Phosphorus (P) is in Period 3, Group 15. It has a larger atomic radius than S as it is to the left of S in the same period.

Answer:

A. Ar, B. Cl, D. O