Question

------Define Metallic Radius..​

Answer 1

$\huge\bold{He¥\: Mate}$

$\textbf{\underline{HERE IS YOUR ANSWER}}}$
$<b>$
=============================
➡️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.
=============================

❤️Thank you❤️

Answer 2

$\huge\underline\mathbf\red{Answer:}$

✏️A metallic radius is the measurement of an atom's size with regards to metal elements only.