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

$\huge{\bold{Metallic \:Radius\: :}}$

Half the distance between centers of nuclei of two adjacent atoms in the crystals.

• Formed by the transfer of valence electrons from metals. So, more the number of valence electron, more number of mobile electrons and they get bonded and form metallic crystals.

$\boxed{*\:More\: Information\::}$

It is a type of Atomic Radii.

Now $\underline{What\: is \:Atomic \:Radii.?}$

The distance from the centre of nucleus to the outermost shell containing the electrons.

But it is difficult to determine exactly because :

• Atoms don't have a sharp or definite boundary.

• Not possible to isolate a single atom.

• Presence of surrounding atoms also affect the distribution of electrons.

• Atomic radius also changes in different bounded states like Ionic bond, Covalent bond.

$\underline{Types \:of \:Atomic\: Radii \::}$

1) Covalent Radius.

2) Vander-waal Radius.

3) Ionic Radius

4) Metallic Radius

$\implies$ As we know that;

Atomic Radius $\alpha$ $\dfrac{1}{Force\:of\: Attraction}$

Vander-waal Radius > Metallic Radius > Ionic Radius > Covalent Radius