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

1.	Which of the following statement(s) is(are) true?
Answer» IONISATION energy `prop 1/"Screening effect"` The 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 `2.3A^@` and `2.03A^@` respectively Answer :A::B::C::D

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