The atomic numbers of elements A,B,C and D ar | vedclass

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(C) Given,atomic number of $B = Z$. Since $B$ is a noble gas,it belongs to group $18$.The atomic number of $A = Z-1$,which corresponds to a halogen (g

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$(1)$ and $(3)$

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(C) Given,atomic number of $B = Z$. Since $B$ is a noble gas,it belongs to group $18$.The atomic number of $A = Z-1$,which corresponds to a halogen (group $17$).The atomic number of $C = Z+1$,which corresponds to an alkali metal (group $1$).The atomic number of $D = Z+2$,which corresponds to an alkaline earth metal (group $2$).Statement $(1)$: Halogens $(A)$ have high electron affinity. This is correct.Statement $(2)$: $C$ is an alkali metal,so it exists in $+1$ oxidation state,not $+2$. This is incorrect.Statement $(3)$: $D$ is an alkaline earth metal (group $2$). This is correct.Therefore,statements $(1)$ and $(3)$ are correct.

The atomic numbers of elements $A$,$B$,$C$ and $D$ are $Z-1$,$Z$,$Z+1$ and $Z+2$,respectively. If $B$ is a noble gas,choose the correct statements from the following:
$(1)$ $A$ has high electron affinity
$(2)$ $C$ exists in $+2$ oxidation state
$(3)$ $D$ is an alkaline earth metal

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The atomic numbers of elements $A$,$B$,$C$ and $D$ are $Z-1$,$Z$,$Z+1$ and $Z+2$,respectively. If $B$ is a noble gas,choose the correct statements from the following:$(1)$ $A$ has high electron affinity$(2)$ $C$ exists in $+2$ oxidation state$(3)$ $D$ is an alkaline earth metal