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Correct! Both \(X\) and \(Y\) have an atomic number of \(1\). As their atomic numbers are the same, their chemical properties will be similar.
Such atoms are called isotopes. That is, isotopes are atoms of the same element, with the same atomic number, but, different mass number.
Which of the following is not an isotope?
  • \(^6_3 X\) and \(^7_3 Y\)
  • \(^{10}_5 X\) and \(^{12}_5 Y\)
  • \(^5_3 X\) and \(^6_3 Y\)
  • \(^8_4 X\) and \(^9_5 Y\)