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a
Valence electrons remain within the fields of influence of their own kernels
b
Kernels as well as the electrons move rapidly
c
Valence electrons are localized between the two kernels
d
Valence electrons constitute a sea of mobile electrons
answer is D.
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Detailed Solution
The outer shell electrons in a metallic crystal tend to be delocalized, that is they are loosely bound to their nuclei. Metal atoms consists of an array of positive ions immersed in a sea of delocalized valence electrons.