1.

Which of the following statement(s) in (are) true ?

Answer»

IONISATION energy `prop 1/("Screening EFFECT")`
The first ionisation energies of Be and Mg are more than ionisation energies of B and Al respectively
Atomic and ionic radii of Niobium and Tantalum are almost same
Metallic and COVALENT radii of potassium are 2.3 Å and 2.03 Å respectively

Solution :(A)As screening effect increases, effective NUCLEAR charge decreases and thus valence shell ELECTRON is loosely bound.Hence ionization energy decreases.
(B)Be and Mg and have `ns^2` configuration (stable configuration)
( C)Due to lanthanide contraction.
(D)`r_("metallic")gtr_("covalent")`(covalent bond formation involves the overlapping of orbitals)


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