Question

which characteristics of metal atoms help explain why valence electrons in a metal are delocalized? metal atoms are large and have high electronegativities. metal atoms are small and have low electronegativities. metal atoms are large and have low electronegativities. metal atoms are small and have high electronegativities.

Explanation:

金属原子半径较大，电负性较低。较大的原子半径使得最外层电子离原子核较远，受到的束缚较小；低电负性意味着金属原子吸引电子的能力弱，容易失去价电子，从而使价电子能够在金属中自由移动（离域）。

Answer:

Metal atoms are large and have low electronegativities.