Maharashtra BoardEnglish MediumSTD 9ScienceMeasurement of Matter3 Marks
Question
The valency of chlorine $(Cl)$ is one.
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Answer
The electronic configuration of chlorine $(Cl)$ is $(2, 8, 7).$ It has $7$ electrons in its 3rd orbit.
It tends to take one electron from another atom so that it has 8 electrons in the outermost orbit with electronic configuration $(2,8,8)$ with stable state.
The gaining of one electron leads to formation of chloride ion $(Cl^–)$ which is negatively charged as it has gained one electron.
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