Answer:
2.06×[tex]10^{10}[/tex] atoms
Explanation:
The radius of potassium atoms= 231 pm
convert parts per million into m i.e, by multiplying by [tex]10^{-6}[/tex]
= 231×[tex]10^{-6}[/tex]
Potassium atoms would have to laid down at a distance apart= 4.77 mm
convert millimeter into meter i.e, by multiplying by [tex]10^{-6}[/tex]
= 4.77 ×[tex]10^{-6}[/tex]
Now, we have to find the number of potassium atoms,
Number of potassium atoms=[tex]\frac{4.77 . 10^{-6} }{231.10^{-6} }[/tex]
Number of potassium atoms=2.06×[tex]10^{10}[/tex]
Number of potassium atoms= 2.06×[tex]10^{10}[/tex] atoms
Hence, the correct answer is 2.06×[tex]10^{10}[/tex] atoms
