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In how many of the following, the second element has a higher density than the first one? (1) Ag,Au , (2) Hf, Zr , (3) Zn, Hg (4) Na, Cu , (5) Ca,Co , (6) Ta, Nb

Answer»


SOLUTION :Third row transition ELEMENT have higher density than second row element. d-block element have higher density than GROUP IA and IIA elements. Note that atomic size DECREASES or remains ALMOST same and atomic weight increases and so show higher density.


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