Which of the following is not a type of basic structure for a pure metal?

A. substitutional

B. body-centered cubic

C. face-centered cubic

D. hexagonal close-packed

The answer is a or d

The correct answer is A.

Explanation:

The body-centered cubic structure (BCC) is a type of crystalline structure. It occurs in all alkaline metals.

There is also the cubic structure centered on the face (FCC) in metals that are easily deformable, such as iron, copper, and silver.

The compact hexagonal mesh is found in metals such as beryllium, magnesium, and zinc. It is a structure that does not allow malleability and ductility, so it is very fragile.

Therefore, option A is the one that does not correspond to a basic type of structure of a pure metal.

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