# Which of the Following Pairs Are Isotopes ? Give Reasons for Your Choice : (I) 58 26 a , 58 28 B Or (Ii) 79 35 X , 80 35 Y - Science

Short Note

Which of the following pairs are isotopes ? Give reasons for your choice :

(i) ""_26^58"A",  ""_28^58"B" or (ii) ""_35^79"X",  ""_35^80"Y"

#### Solution

(i) Atoms of the same element can have different numbers of neutrons; the different possible versions of each element are called isotopes. ""^58"A"_58 and ""^58"B"_28 are not isotopes because they have different atomic numbers.
(ii)""^79"X"_35 and ""^80"Y"_35 are isotopes as they have same atomic number.

Concept: Isotopes
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#### APPEARS IN

Lakhmir Singh Class 9 Chemistry - Science Part 2
Chapter 4 Structure of the Atom
Questions Based On High Order Thinking Skills (HOTS) | Q 54 | Page 213