The volume of a single aluminium atom is 1.22 times 10^(- 23)1.22×10−23 "cm"^(3)cm3.
11 "cm"^(3)cm3 is equivalent to 0.0010.001 "L"L, or 10^(- 3)10−3 "L"L.
So, 1.22 times 10^(- 23)1.22×10−23 "cm"^(3)cm3 is equivalent to 1.22 times 10^(- 23) times 10^(- 3) = 1.22 times 10^(- 26)1.22×10−23×10−3=1.22×10−26 "L"L.
Now, to go from litres ("L")(L) to micro-litres (mu "L")(μL), we multiply the value by 10^(6)106.
Therefore, 1.22 times 10^(- 26)1.22×10−26 "L"L is equivalent to 1.22 times 10^(- 26) times 10^(6) = 1.22 times 10^(- 20)1.22×10−26×106=1.22×10−20 mu "L"μL.