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UPSC 2016 CDS I GK Paper
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Question : 45
Total: 120
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
Validate
Solution:
Statement (d) is incorrect. We can simply subtract the atomic number from the mass number in order to find the number of neutrons. And every element has its own atomic number and mass number.
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