What is meant van der waals , matallic and covalent radius?
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COVALENT RADIUS- it is half the distance between the centre of nuclei of two covalently bonded atoms in a molecule .for ex; H-H..
METALLIC RADIUS-it is the distance between the two atom's nuclei which are tightly bonded with each other.this gives them the strength of metals.for ex- FE-FE....
formula to calculate-da-a/2
where [da-b= Ra+Rb-0.09∆xa-b.] Stevenson shömaker'd equation.
VANDER WALL RADIUS- it is the defined as the half the distance between the atoms of inert gases.the Vander waal radius is the largest in the period.for ex.HE-HE..
note that,
radii(Vander waal )>radii(metallic)>radii(covalent).
METALLIC RADIUS-it is the distance between the two atom's nuclei which are tightly bonded with each other.this gives them the strength of metals.for ex- FE-FE....
formula to calculate-da-a/2
where [da-b= Ra+Rb-0.09∆xa-b.] Stevenson shömaker'd equation.
VANDER WALL RADIUS- it is the defined as the half the distance between the atoms of inert gases.the Vander waal radius is the largest in the period.for ex.HE-HE..
note that,
radii(Vander waal )>radii(metallic)>radii(covalent).
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