Which of the following lists contains at least one element classified as a metal?

• A. O, N, F
• B. Na, Cl, He
• C. C, S, P
• D. Ne, Ar, Kr

Answer: (B)

Verified step by step guidance

1. Step 1: Understand the classification of elements into metals, nonmetals, and metalloids based on their position in the periodic table.
2. Step 2: Identify the elements in each list and determine their classification. For example, O (oxygen), N (nitrogen), and F (fluorine) are all nonmetals.
3. Step 3: Examine the list Na, Cl, He. Sodium (Na) is an alkali metal, chlorine (Cl) is a nonmetal, and helium (He) is a noble gas (nonmetal).
4. Step 4: Check the other lists: C (carbon), S (sulfur), P (phosphorus) are all nonmetals; Ne (neon), Ar (argon), Kr (krypton) are noble gases (nonmetals).
5. Step 5: Conclude that the list containing at least one metal is the one with Na, because sodium is a metal.