CBSE Class 12-science Answered
WHAT ARE ISOTONES AND ISOTOPES CORRECT DEFINITION?
Asked by sharonashoksp | 27 Jun, 2021, 14:44: PM
Isotones :-
Elements having same number of neutrons but differ in number of protons are called Isotones.
example :-
and ![begin mathsize 14px style C presubscript 20 presuperscript 40 a end style](https://images.topperlearning.com/topper/tinymce/cache/0d3491d79ba1d23b8acc7d0ee0ce5d85.png)
![begin mathsize 14px style K presubscript 19 presuperscript 39 end style](https://images.topperlearning.com/topper/tinymce/cache/304416537b9beb947f7331b2bbfd7c28.png)
![begin mathsize 14px style C presubscript 20 presuperscript 40 a end style](https://images.topperlearning.com/topper/tinymce/cache/0d3491d79ba1d23b8acc7d0ee0ce5d85.png)
In above example, atmic number of Pottasium is 19 and mass number is 39 . Hence
has 19 protons and 20 neutrons
![begin mathsize 14px style K presubscript 19 presuperscript 39 end style](https://images.topperlearning.com/topper/tinymce/cache/304416537b9beb947f7331b2bbfd7c28.png)
Atomic number of Ca is 20 and its mass number is 40. Hence
has 20 protons and 20 neutrons.
![begin mathsize 14px style C presubscript 20 presuperscript 40 a end style](https://images.topperlearning.com/topper/tinymce/cache/0d3491d79ba1d23b8acc7d0ee0ce5d85.png)
Since both these elements have same number of neutrons, these elements are called isotones .
---------------------------------------------------------------------
Isotopes :-
Elements having same number of protons but differ in number of neutrons are called Isotopes.
example :-
and ![begin mathsize 14px style U presubscript 92 presuperscript 238 end style](https://images.topperlearning.com/topper/tinymce/cache/4ffa2629a768b8b003ed3126a7c6c52c.png)
![begin mathsize 14px style U presubscript 92 presuperscript 235 end style](https://images.topperlearning.com/topper/tinymce/cache/a61e6eedd59808f3dcd10d3d5333bd96.png)
![begin mathsize 14px style U presubscript 92 presuperscript 238 end style](https://images.topperlearning.com/topper/tinymce/cache/4ffa2629a768b8b003ed3126a7c6c52c.png)
In above example , atomic number of Uranium is 92 , hence both of these elements have same 92 protons ,
but their neutron numbers differ.
Answered by Thiyagarajan K | 27 Jun, 2021, 15:59: PM
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