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Which of the following statement(s) is(a...

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

A

ionisation energy `prop 1/"Screening effect"`

B

The ionisation energies of Be and Mg are more than ionisation energies of B and Al respectively

C

Atomic and ionic radii of Niobium and Tantalum are almost same

D

Metallic and covalent radii of potassium are `2.3A^@` and `2.03A^@` respectively

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The correct Answer is:
A, B, C, D
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