1.

(i) Represent the change in the nucleus of a radioactive element when α β particle is emitted. (ii) What is the name given to elements with same mass number and different atomic number ? (iii) Under which conditions does the nucleus of an atom tend to be radioactive ?

Answer»

(i) AZX → A Z+1 Y + 0 -1  β  

(ii) Isobars. 

(iii) Isotopes of all elements of atomic number higher than 82 and elements having number of neutrons exceeding the number of protons in their nuclei are tend to be radioactive.



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