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(A) The tendency to gain an electron is related to electron gain enthalpy and electronegativity. Element $A$ $(1s^2 2s^2 2p^6)$ is Neon,a noble gas wi

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$A < C < B < D$

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(A) The tendency to gain an electron is related to electron gain enthalpy and electronegativity. Element $A$ $(1s^2 2s^2 2p^6)$ is Neon,a noble gas with a stable octet,so it has the least tendency to gain an electron. Element $C$ $(1s^2 2s^2 2p^6 3s^1)$ is Sodium,an alkali metal with a strong tendency to lose an electron,so it has very low electron gain tendency. Element $B$ $(1s^2 2s^2 2p^4)$ is Oxygen,which needs two electrons to complete its octet. Element $D$ $(1s^2 2s^2 2p^5)$ is Fluorine,which needs only one electron to complete its octet and is the most electronegative element,thus having the highest tendency to gain an electron. Comparing these,the order of increasing tendency to gain an electron is $A < C < B < D$.

Column-$I$ Electronic Configuration	Column-$II$ Electron Gain Enthalpy / $kJ \ mol^{-1}$
$(A) \ 1s^2 2s^2 2p^6$	$(1) -53$
$(B) \ 1s^2 2s^2 2p^6 3s^1$	$(2) -328$
$(C) \ 1s^2 2s^2 2p^5$	$(3) -141$
$(D) \ 1s^2 2s^2 2p^4$	$(4) +53$

Electronic configurations of four elements $A, B, C$ and $D$ are given below :
$(A)$ $1s^2 2s^2 2p^6$
$(B)$ $1s^2 2s^2 2p^4$
$(C)$ $1s^2 2s^2 2p^6 3s^1$
$(D)$ $1s^2 2s^2 2p^5$
Which of the following is the correct order of increasing tendency to gain electron :

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Electronic configurations of four elements $A, B, C$ and $D$ are given below :$(A)$ $1s^2 2s^2 2p^6$$(B)$ $1s^2 2s^2 2p^4$$(C)$ $1s^2 2s^2 2p^6 3s^1$$(D)$ $1s^2 2s^2 2p^5$Which of the following is the correct order of increasing tendency to gain electron :