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The number of atoms present in one mole of an element is equal to Avogadro number. Which of the following element contains the greatest number of atom

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The number of atoms present in one mole of an element is equal to Avogadro number. Which of the following element contains the greatest number of atom?
A. 4g He
B. 46g Na
C. 0.40 g Ca
D. 12 g He
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Correct Answer - D
No of atoms `=n xx N_(A)`, large no of moles will posses greatest no of atoms.
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