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Solution


Q.

Among 10-9 g (each) of the following elements, which one will have the highest number of atoms            

Element: Pb, Po, Pr and Pt                                                             [2025]
1 Po  
2 Pr  
3 Pb  
4 Pt  

Ans.

(2)

Number of atoms=Given massAtomic mass

As given mass is same for the four elements,

number of atoms∝1Atomic mass.

Po and Pb are present in 6th period, p block. Pt is present in 5d series. Pr is present in 4f series. As Pr is placed before Po, Pb and Pt in periodic table, it has least atomic mass. As it has least atomic mass, it has most number of atoms.