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UPSC CDS 2 2019 GK Paper

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Question : 96

Total: 119

Which one of the following statements is not correct ?

Elements are defined by the number of protons they possess.
Isobars are atoms having the same atomic number but different mass number.
The mass number of an atom is equal to the number of nucleons in its nucleus.
Valency is the combining capacity of an atom.

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