Question

which of the following names a pair of elements that would likely form a substitutional alloy and explains why? a ni and cu, because ni atoms would fit in the spaces between cu atoms in the solid lattice. b ni and cu, because ni atoms would take the place of cu atoms in the solid lattice. c w and n, because n atoms would fit in the spaces between w atoms in the solid lattice. d w and n, because n atoms would take the place of w atoms in the solid lattice.

Explanation:

A substitutional alloy forms when atoms of one element replace atoms of another element in a solid - lattice. Ni (nickel) and Cu (copper) are both metals with similar atomic sizes. Ni atoms can take the place of Cu atoms in the solid lattice to form a substitutional alloy. In options A and C, the description is for an interstitial alloy where smaller atoms fit into the spaces between larger atoms. In option D, N (nitrogen) is a non - metal and W (tungsten) is a metal, and their atomic sizes and bonding characteristics are such that N atoms cannot substitute for W atoms in a lattice to form a substitutional alloy.

Answer:

B. Ni and Cu, because Ni atoms would take the place of Cu atoms in the solid lattice.