Periodic properties can be chemical properties or physical properties. Correct statement about periodic properties is
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a
Vanderwaals radius is measured for Argon gas
b
2nd electron gain enthalpy of every element is positive
c
1st electron gain enthalpy of inert gases has large negative value
d
Metallic radius of copper is lesser than its covalent radius.
answer is B.
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Detailed Solution
(1) Vanderwaals radius measured for solids(2) O−g+e− → O−2; ΔH = +780kJ/mole2nd electron gain enthalpy is always positive due to the repulsions between negative charge and added electron(3) ΔHeg for Noble gases is positive due to stable configuration (4) For Cu, Metallic radius (Atomic radius ) > Covalent radius