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JEE Main202116 Mar 2021Evening ShiftChemistryClassification of Elements and Periodicity in PropertiesActual

Identify the elements X and Y using the ionization energy values given below : Ionization energy ( kJ / mol ) 1 st 2 nd X 495 4563 Y 731 1450

Options

  1. AX = Na ; Y = Mg
  2. BX = Mg ; Y = F
  3. CX = Mg ; Y = Na
  4. DX = F ; Y = Mg

Correct answer

A. X = Na ; Y = Mg

Step-by-step solution

Na → Ne 3 s 1 IE 1 is very low but IE 2 is very high due to stable noble gas configuration of Na + . Mg → Ne 3 s 2 IE 1 and IE 2 → Low IE 3 is very high.

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