Which of the following lists consists only of metals?

• A. O, S, Cl
• B. C, Si, P
• C. Na, Fe, Cu
• D. He, Ne, Ar

Answer: (C)

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 category: metals are typically found on the left and center of the periodic table, nonmetals on the right, and metalloids along the dividing line.
3. Step 3: For the list 'O, S, Cl', recognize that oxygen (O), sulfur (S), and chlorine (Cl) are all nonmetals.
4. Step 4: For the list 'C, Si, P', note that carbon (C) and phosphorus (P) are nonmetals, while silicon (Si) is a metalloid.
5. Step 5: For the list 'Na, Fe, Cu', identify sodium (Na), iron (Fe), and copper (Cu) as metals, confirming this list consists only of metals.