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JEE Main 20208 JanuaryMorning Shift
Exam
JEE Main
Year
2020
Date
8 January
Shift
Morning Shift
Subject
Chemistry
Chapter
Classification of Elements and Periodicity in Properties

JEE Main 2020 · 8 January · Morning Shift · Chemistry · Classification of Elements and Periodicity in Properties

The first ionization energy (in kJ / mol ) of Na, Mg, Al and Si...

The first ionization energy (in kJ/molkJ / mol )ofNa,Mg,Alof Na, Mg, Al and SiSi respectively are:

Options

  1. A496,737,577,786496, 737, 577, 786
  2. B496,577,737,786496, 577, 737, 786
  3. C786,737,577,496786, 737, 577, 496
  4. D496,577,786,737496, 577, 786, 737

Correct answer

A. 496,737,577,786496, 737, 577, 786

Step-by-step solution

Correct order of ionisation energy will be : Na < Al < Mg < Si.

On going from left to right in periodic table effective nuclear charge increases due to which ionisation energy increases. But there is exception in order of Al and Mg, in case of Mg electron is removed from fulfilled 's' subshell due to which it has higher I.E.

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