Define covalent radius and vanderwaals radius?
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covalent radius - it is defined as half the covalent bond length when the two atoms bonded are homonuclear. rcov is typically measured by X-ray diffraction. When multiple allotropes exist for a given element, rcov is determined by averaging the bond distances found in each allotrope. Covalent radius is measured in picometers (pm) or ångströms (Å) and represents one measurement that is used in determining atomic radius.
vanderwaals radius - van der Waals radius is used to define half of the distance between the closest approach of two non-bonded atoms of a given element.
covalent radius - it is defined as half the covalent bond length when the two atoms bonded are homonuclear. rcov is typically measured by X-ray diffraction. When multiple allotropes exist for a given element, rcov is determined by averaging the bond distances found in each allotrope. Covalent radius is measured in picometers (pm) or ångströms (Å) and represents one measurement that is used in determining atomic radius.
vanderwaals radius - van der Waals radius is used to define half of the distance between the closest approach of two non-bonded atoms of a given element.
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covalent radius is half of the internuclear between the nuclei of two single bonded atoms of the same species while van der waals radius is used to define half of the distance between the closest approach of two non bonded atoms of given element
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