SELECT * FROM question_mgmt as q WHERE id=4009 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=8 AND subId=16 AND chapterId=183 and ex_no='7' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 9th science Structure of the Atom write the electronic configuration of any one pair

Question:

Write the electronic configuration of any one pair of isotopes and isobars.

Answer:

(a) Isotopes: Isotopes are iotas which have similar number of protons however extraordinary number of neutrons. They have same nuclear number yet unique mass number.
Model: Carbon particle exists as 6C12 and 6C14 however when their electronic configuration is K-2; L-4
(b) Isobars: Isobars are particles which have a similar mass number however extraordinary nuclear number.
Model: Electronic configuration of 20Ca40is – K-2; L-8; M-8; N-2 and of 18Ar40 is – K-2; L-8; M-8


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