Chapter 4

NCERT
Class 9
Science
Solutions
13. Composition of the nuclei of two atomic species X and Y are given below :

Question:

Composition of the nuclei of two atomic species X and Y are given below :

X Y
Protons 6 6
Neutron 6 8

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

Answer:

Mass number = Number of Proton Number of Neutron

Mass number of Y = 6 + 6 = 12

Mass number of Y = 6 + 8 = 14 and Atomic number = Number of Proton

Atomic number of X = 6

Atomic number of Y = 6

Since, X and Y have same atomic number but have different mass number so they are isotopes.

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