Question

composition of nuclei of two atomic species X and Y are as follows : (1). X Protons 6 Neutrons 8 (2). Y Protons 6 Neutrons 6
(i) Calculate the mass number of X and Y
(ii) How are X and Y related to each other

Answer 1

mass no.X= no.of proton + no. of neutron = 6+8=14 mass no. of Y =6+6=12 X and Y are isotopes as their atomic no./no. of protons are same but mass no. different

Answer 2

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Mass number of X = Number of protons + Number of neutrons

= 6 + 6

= 12

Mass number of Y = Number of protons + Number of neutrons

= 6 + 8

= 14

These two atomic species X and Y have the same atomic number, but different mass numbers. Hence, they are isotopes.

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