The mass of an electron is approximately equal to 9×10−31 kg. If the total mass of an atom is 18×10−25 kg, find the ratio of the mass of an electron to the total mass of an atom.
A
12×106
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B
2×106
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C
12×105
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D
2×105
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Solution
The correct option is A12×106 ∙ Mass of an electron =9×10−31 kg ∙ Total mass of an atom =18×10−25 kg ∴ Ratio of the mass of an electron to the total mass of an atom =Mass of an electronTotal mass of an atom