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NCERT Class XI Chemistry Structure of Atom Solutions

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Question : 39 of 67
Marks: +1, -0
In Millikan’s experiment, static electric charge on the oil drops has been obtained by shining X-rays. If the static electric charge on the oil drop is – 1.282 × 10−1810^{-18} C, what will be the number of electrons present on it?
Solution:  
Charge of one electron = – 1.602 × 10−1910^{-19} C
Number of electrons = −1.282×10−18−1.602×10−19\frac{-1.282\times10^{-18}}{-1.602\times10^{-19}} = 8
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