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Structure of the Atom — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceStructure of the Atom3 Marks
Question
Will ${ }^{35} Cl$ and ${ }^{37} Cl$ have different valencies? Justify your answer.
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Answer

No, ${ }^{35} Cl$ and ${ }^{37} Cl$ have same valency.
${ }^{35} Cl$ and ${ }^{37} Cl$ 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 $KLM.$
Electronic configuration $=2,8,7$ Valency $8-7=1$.
Therefore, both of them have valency $=1$.
 

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