German silver, also called nickel silver, is an alloy composed primarily of which three elements?

Introduction / Context:
Trade names can be misleading. “German silver” looks like silver but is a base-metal alloy widely used for its appearance and corrosion resistance in decorative and instrument components.

Given Data / Assumptions:

• No precious metal (Ag) in standard German silver compositions.
• Typical composition ranges: Cu-rich with Ni and Zn.

Concept / Approach:
Nickel silver alloys combine copper, nickel, and zinc. Nickel imparts a silvery color and increases strength; zinc improves castability and reduces cost; copper provides the base matrix and ductility.

Step-by-Step Solution:
1) Exclude options containing silver as a major component; the name is historical and cosmetic.2) Identify the classic Cu–Ni–Zn triad.3) Choose “copper, nickel and zinc.”

Verification / Alternative check:
Materials handbooks list numerous nickel silver grades (e.g., CuNi25Zn18) conforming to this tri-element system.

Why Other Options Are Wrong:
Options including silver are incorrect for standard German silver.
Copper, tin and zinc corresponds to brass/bronze families, not nickel silver.

Common Pitfalls:
Assuming nomenclature implies elemental content; always confirm with compositional standards.

Final Answer:
copper, nickel and zinc