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Q.

The element ‘X’ with atomic number 10 exists as gas, chemically inert and it is high stable.  The radius could be measured for  X

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a

covalent radii

b

vander Waal’s radii

c

ionic radii

d

crystal radii

answer is D.

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Detailed Solution

Reason: The element with atomic number 10 is Ne.  It is an inert gas with             nsଶ np଺  electronic configuration .It is Ne (noble gas) In noble gases vander wall’s radii have been measured. Due to Noble gases do not form covalent bonds.

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