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Which of the following statement(s) in (are) true ?A. Ionisation energy `prop 1/("Screening effect")`B. The first ionisation energies of Be and Mg are more than ionisation energies of B and Al respectivelyC. Atomic and ionic radii of Niobium and Tantalum are almost sameD. Metallic and covalent radii of potassium are 2.3 Å and 2.03 Å respectively |
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Answer» Correct Answer - A,B,C,D (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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