UPSC NDA I 2012 General Ability Paper

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Question : 94 of 150

Marks: +1, -0

Which one among the following is the most appropriate statement with respect to the atomic weight of an element?

The atomic weight of an element is the sum total of the number of protons and neutrons present in the atom of the element
Unlike mass number, the atomic weight of an element can be a fraction
The atomic weight of an element is a whole number
The atomic weight of all the atoms in an element is the same

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