InterviewSolution
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InterviewSolution
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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 statement among the following statements : I. A has higher electron affinity. II. C exists in +2 oxidation state. III. D is an alkaline earth metal.A. I and IIB. II and IIIC. I and IIID. I, II and III |
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Answer» `A = Z - 1` `B = Z rarr` Noble gas (outer subshells are s or p) `C = Z + 1` `D = Z + 2` Noble gas with outer s-subshell = `He(1s^(2))` Noble gas with outer p-subshell `=ns^(2)np^(6)` like [Ne] In periodic table, electrons affinity is highest in chlorine of group 17 with electronic configuration of `3s^(2)p^(5)`. Noble gas `=3s^(2)3p^(6)=[Ar]` `B=[Ar]rarr Z rarr 3s^(2)3p^(6)` (Noble gas) `A = Z-1 rarr 3s^(2)3p^(5)` (Halogen family) `C=Z+1rarr 3s^(2)3p^(6),4s^(1)` (Alkali metal) `D = Z+2 rarr 3s^(2)3p^(6),4s^(2)` (Alkaline earth metal) |
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