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.
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Answer 2

As you can see, metallic radius is defined as one-half of the distance between the nuclei of two atoms in crystal or between two adjacent metal ions in the metallic lattice.

Metallic radii:

- decrease across the period due to increase in the effective nuclear charge.

- increase down the group due to increase in principal quantum number.

Hope it helps!