Question

the diagram below shows the structure of an alloy composed of two unknown elements, x and y. which of the following could correspond to elements x and y? choose 1 answer: a ag and pd b fe and cr c cu and zn d ni and c

Explanation:

Step1: Observe alloy structure

The diagram shows a structure where one type of atom (the smaller ones) is interspersed among the larger atoms. This is characteristic of an interstitial alloy, where smaller atoms fit into the interstices (holes) of the lattice of larger atoms.

Step2: Analyze options

In an interstitial alloy, one of the elements is usually a non - metal with a small atomic size that can fit into the spaces of a metal lattice.

• Option A: Ag (Silver) and Pd (Palladium) are both metals and do not form an interstitial alloy.
• Option B: Fe (Iron) and Cr (Chromium) are both metals and do not form an interstitial alloy.
• Option C: Cu (Copper) and Zn (Zinc) are both metals and do not form an interstitial alloy.
• Option D: Ni (Nickel) is a metal and C (Carbon) is a non - metal with a small atomic size. Carbon can fit into the interstices of the nickel lattice to form an interstitial alloy.

Answer:

D. Ni and C