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Structure of the Atom — Science STD 9 — Question

CBSE BoardEnglish MediumSTD 9ScienceStructure of the Atom3 Marks
Question
Will 35Cl and 37Cl have different valencies? Justify your answer.
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Answer

No, 35Cl and 37Cl have same valency. 35Cl and 37Cl are the isotopes. So, they have same number of protons and electrons and have the same atomic number viz. 17 Hence, their electronic configuration and valencies are also the same K L M.
Electronic configuration = 2, 8, 7 Valency 8 - 7 = 1.
Therefore, both of them have valency = 1.

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