Question

which reason best explains why metals are ductile instead of brittle?
○ because they have rigid bonds
○ because they have flexible bonds
○ because they easily lose electrons
○ because they easily gain electrons

Explanation:

金属具有延展性是因为其内部的金属键具有一定的灵活性。金属键是由金属阳离子和自由电子构成的，这种结构允许原子在受力时相对滑动而不断裂，而不是因为有刚性键、易失电子或易得电子。

Answer:

because they have flexible bonds