Ametal has a crystalline structure, which means its atoms are arranged
in a compact, orderly pattern

in a square pattern, like a chess board

in a loose, random manner

end-to-end, like beads on a string

A metal has a crystalline structure, which means its atoms are arranged in a compact, orderly pattern.

Option A

Explanation:

A crystalline structure consists of arrangement of ions in an orderly pattern in a 3 dimensional arrangement. The ions, atoms or molecules combining to form a compound in solid state of matter tend to exhibit ordered arrangement of ions, atoms or molecules respectively if they are forming a crystalline structure.

The atoms, ions or molecules can also combine with random arrangement of  these leading to amorphous structure. So, if the metal comprises with a crystalline structure, then that means that its atoms are made in a compact, ordered pattern.

c is the answer because when something is left after something evaporates that shows the chemical change.