Which element among the following is most probable to have the following values? aligned _i H₁ & =419 ~kJ ~mol ⁻¹ _i H₂ & =305 ~kJ ~mol ⁻¹ _ eg H & =-48 ~kJ ~mol ⁻¹ aligned

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Correct answer: B. K

Atomic number of K =19 Electronic configuration [ Ar ] 4 s^1 K K ⁺+ l e⁻ ; _i H₁=419 ~kJ / mol Potassium has only one electron in outermost shell which looses easily to attain noble gas configuration. K ⁺ K ²⁺+1 e⁻ ; _i H₂=3051 ~kJ / mol Potassium ion has stable noble gas configuration similar to that of argon, from which the removal of electron becomes difficult resulting into increase in IE ₂ . Potassium being a metal is electropositive in nature, which has low electron affinity resulting into low electron gain e

Which element among the following is most probable to have the following values? aligned _i H₁ & =419 ~kJ ~mol ⁻¹ _i H₂ & =305 ~kJ ~mol ⁻¹ _ eg H & =-48 ~kJ ~mol ⁻¹ aligned

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