Which one of the following solid samples exactly contains the minimum number of atoms?

Question

Professor PC Thomas Classes · Answer

(d) : The number of atoms is given by $\frac{	ext{Mass}}{	ext{Atomic mass}} 	imes N_A$. Since the given mass is identical ($2 \mathrm{~g}$) for all four options, the element with the highest atomic mass will mathematically have the minimum number of atoms. Iron (Fe) has the highest atomic mass (56), hence it contains the minimum number of atoms.