Question

define mettalic radius​

Answer 1

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➡️It is defined as one-half the inter-nuclear distance between the two adjacent metal ions in the metallic lattice.

➡️ Mettalic radii decrease across the period due to increase in the effective nuclear charge.
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Answer 2

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IT IS DEFINED AS ONE HALF OF THE INTERNUCLEAR DISTANCE BETWEEN THE TWO ADJACENT METAL IONS IN THE METTALIC LATTICE