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Per NCERT, the METALLIC RADIUS of a metal atom is defined as which quantity?
AThe atomic mass
BHalf the distance between two adjacent metal cores in the metallic crystal (e.g. Cu–Cu 256 pm → r=128 pm)
CFull distance between adjacent atoms
DHalf the Cu+/Cu²+ ionic distance
Answer & Solution
Correct answer: B. Half the distance between two adjacent metal cores in the metallic crystal (e.g. Cu–Cu 256 pm → r=128 pm)
Per NCERT §3.7.1(a), Cu solid Cu–Cu = 256 pm → r metallic = 128 pm. Half the inter-nuclear distance.
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