A student is comparing samples of sulphur, carbon (Diamond), and bromine. Which property is least likely to be observed in all three?
High electrical conductivity
Sulphur, diamond (a form of carbon) and bromine are all non-metals, and a defining property of non-metals is that they are poor conductors of electricity because they lack free, mobile electrons.
All three do share a dull (non-lustrous) appearance in their common form, are brittle when solid, and act as poor conductors of heat, which are typical non-metallic behaviours.
Hence, high electrical conductivity is the property least likely to be observed in all three.
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