The atomic numbers of elements $A, B, C$ and $D$ are $Z-1, Z, Z+1$ and $Z+2$, respectively. If ' $B$ ' is a…
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 answers from the following statements
(1) ' $A$ ' has higher electron affinity
(2) ' $C$ ' exists in +2 oxidation state
(3) ' $D$ ' is an alkaline earth metal
(1) and (2)
(2) and (3)
(1) and (3)
$(1),(2)$ and (3)
Solution
Given,
Atomic number of element $B=Z$
( $\because$ noble gas $\quad \therefore$ belong to zero group)
Atomic number of element $A=Z-1$
(ie, halogens)
Atomic number of element $C=Z+1$
(ie, group IA)
Atomic number of element $D=Z+2$
(ie, group IIA)
$\because$ Element $B$ is a noble gas
$\therefore$ Element $A$ must be a halogen ie, have highest electron affinity.
and element $C$ must be an alkali metal and exist in +1 oxidation state.
and element $D$ must be an alkaline earth metal with +2 oxidation state.