Answer:
[tex]1.551\times 10^7[/tex] atoms of palladium are to be laid side by side to span a distance of 4.25 mm.
Explanation:
The radius of the palladium atom, r = 137 pm
Diameter of the palladium atom = 2r = 137 pm = 274 pm
Let the number of palladium atoms laid side by side be x
Length of the chain = 4.25 mm = [tex]4.25\times 10^9 pm[/tex]
[tex]1 mm = 10^9 pm[/tex]
[tex]x\times 274 pm =4.25\times 10^9 pm[/tex]
[tex]x=\frac{4.25\times 10^9 pm}{274 pm}=1.551\times 10^7[/tex]
[tex]1.551\times 10^7[/tex] atoms of palladium are to be laid side by side to span a distance of 4.25 mm.
