Final answer:
If the temperature change in a metal is gradual, the structure of the crystals changes somewhat but is not excessively disrupted due to the strong metallic bonding. The correct answer is option: somewhat
Step-by-step explanation:
In a metal, if the temperature change is gradual, the structure of the crystals changes somewhat but is not excessively disrupted. This is because the atoms in a metal are held together by metallic bonding, which is a strong force of attraction between the metal atoms. When the temperature gradually increases, the metal atoms can adjust their positions within the crystal lattice without completely breaking the metallic bonds.
For example, when copper is heated, the atoms in the crystal lattice vibrate more vigorously. As the temperature continues to rise, the atoms gradually shift positions and the crystals may expand. However, the metallic bonding remains intact.