Classification – Odd one out (alloy vs pure element): Identify the outlier: Zinc, Bronze, Silver, Platinum.

Introduction / Context:
Materials classification can separate pure chemical elements from alloys. Three items are chemical elements, while one is a mixture (alloy), making it the odd one out.

Given Data / Assumptions:

• Zinc → element (Zn).
• Silver → element (Ag).
• Platinum → element (Pt).
• Bronze → alloy, typically copper + tin (may include other elements).

Concept / Approach:
Check if the item is on the periodic table (element) or a composition of elements (alloy). The single alloy is the outlier.

Step-by-Step Solution:
Zinc, Silver, Platinum → elements.Bronze → alloy, not a pure element.

Verification / Alternative check:
Other classic alloys (brass, steel) confirm the pattern; “bronze” is not a chemical symbol and its composition varies by formulation.

Why Other Options Are Wrong:

• Zinc, Silver, Platinum are single elements; they belong together.

Common Pitfalls:
Confusing “metal” with “element.” Alloys are metallic but not elemental.

Final Answer:
Bronze