Q, Y, Z, B and D are the elements belonging to 15th group of Modern periodic table. The correct trend of melting point in these elements is Q > Y > Z > B > D. The element ‘Q’ in the sequence is
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Q, Y, Z, B and D are the elements belonging to 15th group of Modern periodic table. The correct trend of melting point in these elements is Q > Y > Z > B > D. The element ‘Q’ in the sequence is