The table lists atomic radii for four pairs of elements that are being evaluated for…
CHEMISTRY · Multi-part · AP · Chemistry · Compound Structure and Properties · Compound Structure and Properties
Problem
The table lists atomic radii for four pairs of elements that are being evaluated for possible alloy formation in an fcc lattice.
Pair Host (pm) Solute (pm)
P 125 120
Q 140 112
R 130 149
S 135 70
(a) For each pair, calculate the percent difference in atomic radius between host and solute atoms. Present your answers to the nearest whole percent.
(b) Using only the size criterion, classify each pair as MOST LIKELY to form a predominantly substitutional alloy, a predominantly interstitial alloy, or neither. State your reasoning clearly for each pair.
(c) Rank the four pairs from greatest to least expected solid solubility of the solute in the host. Briefly justify the ordering you assign.