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The number of atoms present in one mole of an element is equal to Avogadro number. Which of the following elements contains the greatest number of atoms ?
(a) 4gHe
(b) 46gNa
(c) 0.40 gCa
(d) 12 g He

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(d) As we know that 

Hence, 12 g of He contains the greatest number of atoms.

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