UPSC CDS Science Chemistry Questions Part 1

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Question : 60 of 100

Marks: +1, -0

Which one of the following statements is not correct?

[2016 CDS-I]

Atoms of different elements may have same mass numbers
Atoms of an element may have different mass numbers
All the atoms of an element have same number of protons
All the atoms of an element will always have same number of neutrons

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