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Which one of the following statements is not correct?
[CDS I 2016]
1) Atoms of different elements may have same mass numbers
2) Atoms of an element may have different mass numbers
3) All the atoms of an element have same number of protons
4) All the atoms of an element will always have same number of neutrons
What are neutrons?
Neutron = Mass number- Atomic Number (or Protons/Electrons)
So, if Mass number may have different then how can neutron be always same.
Covered in Both 9th and 11th NCERT
4) All the atoms of an element will always have same number of neutrons