Concept:Alnico is an alloy whose name is derived from the chemical symbols of its main components: aluminium, nickel, and cobalt.
Explanation:The name “Alnico” is formed from “Al” (aluminium), “Ni” (nickel), and “Co” (cobalt).
Thus, the third constituent required in the question is cobalt.
Cobalt is represented by the symbol
Co in the periodic table.
Alnico is often used to make strong permanent magnets because of its ferromagnetic properties.
Option A,
Mg (magnesium); option C,
Mn (manganese); and option D,
Cu (copper) do not match the Al-Ni-Co composition pattern.
Answer:The correct option is B. Co (Cobalt).