Question
Distinguish between:
Group $17$ - Group $18$
Group $17$ - Group $18$
| Group 17 | Group 18 | |
| 1. | Elements of group $17$ are called halogens. | Elements of group $18$ are called inert gas elements or noble gases. |
| 2. | They have seven valence electrons. | They have eight valence electrons except helium which contains $2$ electrons. |
| 3. | Their valency is $1$. | Their valency is zero. |
| 4. | They form diatomic molecules with general formula $(X_2)$. | They are monoatomic gases under normal conditions. |
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