WHAT ARE ISOTONES AND ISOTOPES CORRECT DEFINITION?

Asked by sharonashoksp | 27th Jun, 2021, 02:44: PM

Expert Answer:

Isotones :-
Elements having same number of neutrons but differ in number of protons are called Isotones.
 
example :-  begin mathsize 14px style K presubscript 19 presuperscript 39 end style and  begin mathsize 14px style C presubscript 20 presuperscript 40 a end style
In above example, atmic number of  Pottasium is 19 and mass number is 39 . Hence  begin mathsize 14px style K presubscript 19 presuperscript 39 end style has 19 protons and 20 neutrons
Atomic number of Ca is 20 and its mass number is 40. Hence begin mathsize 14px style C presubscript 20 presuperscript 40 a end style has 20 protons and 20 neutrons.
Since both these elements have same number of neutrons, these elements are called isotones .
 
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Isotopes :-
 
Elements having same number of protons but differ in number of neutrons are called Isotopes.
 
example :-  begin mathsize 14px style U presubscript 92 presuperscript 235 end style  and  begin mathsize 14px style U presubscript 92 presuperscript 238 end style
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 | 27th Jun, 2021, 03:59: PM