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A molecule with the formula AX 4 Y has all its elements from p-block. Element A is rarest, monoatomic, non-radioactive from its group and has the lowest ionization enthalpy value among A, X and Y. Elements X and Y have first and second highest electronegativity values respectively among all the known elements. The shape of the molecule is :

1. Trigonal bipyramidal
2. Square pyramidal
3. Octahedral
4. Pentagonal planar

Correct answer: Square pyramidal

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