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Question

One atomic mass unit is _______ of the mass of one atom of _________ isotope.


A

, Hydrogen

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B

, Carbon-14

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C

, Carbon-12

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D

, Sulphur

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Solution

The correct option is C

, Carbon-12


One atomic mass unit is 112th of the mass of one atom of carbon-12 isotpoe. This implies that to get 1 unit of this mass we will have to take one carbon-12 atom, cut it up into 12 equal parts and weigh one of these parts.

For atomic mass we consider only the C-12 isotope and not C-13 or C-14 isotopes for some scientific reasons.


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