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

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(C) Given that the atomic number of $B$ is $Z$. Since $B$ is a noble gas,it belongs to group $18$.Therefore,the element $A$ with atomic number $Z-1$ i

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$(1)$ and $(3)$

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(C) Given that the atomic number of $B$ is $Z$. Since $B$ is a noble gas,it belongs to group $18$.Therefore,the element $A$ with atomic number $Z-1$ is a halogen (group $17$),which has a very high electron affinity.The element $C$ with atomic number $Z+1$ is an alkali metal (group $1$),which exists in a $+1$ oxidation state.The element $D$ with atomic number $Z+2$ is an alkaline earth metal (group $2$),which exists in a $+2$ oxidation state.Thus,statement $(1)$ is correct ($A$ is a halogen) and statement $(3)$ is correct ($D$ is an alkaline earth metal). Statement $(2)$ is incorrect because $C$ exists in a $+1$ oxidation state.

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