Which of the following lists of elements is arranged from smallest to largest atomic radius?

• A. Ne, Na, Mg, Al
• B. Li, Na, K, Rb
• C. O, N, C, B
• D. F, O, N, C

Answer: (C)

Verified step by step guidance

1. Recall that atomic radius generally decreases from left to right across a period in the periodic table due to increasing nuclear charge pulling electrons closer to the nucleus.
2. Recall that atomic radius generally increases from top to bottom within a group because additional electron shells are added, increasing the size of the atom.
3. Analyze each list by identifying the position of each element in the periodic table and comparing their atomic radii based on their group and period.
4. For example, in the list Ne, Na, Mg, Al: Ne is a noble gas in period 2, Na is an alkali metal in period 3, Mg and Al are in period 3 but different groups; consider how atomic radius changes across periods and groups.
5. Determine which list correctly orders elements from smallest to largest atomic radius by applying these periodic trends to each element in the lists.