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How many of the following the second ele...

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

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The correct Answer is:
4
1,2,3,4,5 has second elementwith high density
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