Composition of the nuclei of two atomic species X and Y are given as under

                  X  Y

Protons   = 6  6

Neutrons = 6  8

Give the mass numbers of X and Y. What is the relation between the two species?

 

Answer

 

X

Y

Protons

6

6

Neutrons

6

8

Mass number of an atom = Number of protons + Number of Neutrons

6 + 6 = 12

6 + 8 = 14



  • Protons of X = Protons of Y
  • So, Atomic number  of X = Atomic number of Y
  • Mass number  of X Mass number of Y

 

Elements having the same atomic numbers but different mass numbers are called isotopes and have the same electronic configuration and chemical properties.

Therefore, X and Y are isotopes.

  1. Class 9
  2. Chapter 4 Class 9 - Structure of Atom (Term 2)

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CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 11 years and a teacher from the past 11 years. He teaches Science, Accounts and English at Teachoo