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JEE Main 20204 SeptemberMorning Shift
Exam
JEE Main
Year
2020
Date
4 September
Shift
Morning Shift
Subject
Chemistry
Chapter
Classification of Elements and Periodicity in Properties

JEE Main 2020 · 4 September · Morning Shift · Chemistry · Classification of Elements and Periodicity in Properties

The ionic radii of O ^ 2 – , F ^ – , Na ^ + and Mg ^ 2 + are in the...

The ionic radii of O2–,F–,Na+{O}^{2 –}, {F}^{–}, {Na}^{+} and Mg2+{Mg}^{2 +} are in the order:

Options

  1. AF–>O2–>Na+>Mg2+{F}^{–} > {O}^{2 –} > {Na}^{+} > {Mg}^{2 +}
  2. BO2–>F–>Na+>Mg2+{O}^{2 –} > {F}^{–} > {Na}^{+} > {Mg}^{2 +}
  3. CMg2+>Na+>F–>O2–{Mg}^{2 +} > {Na}^{+} > {F}^{–} > {O}^{2 –}
  4. DO2–>F–>Mg2+>Na+{O}^{2 –} > {F}^{–} > {Mg}^{2 +} > {Na}^{+}

Correct answer

B. O2–>F–>Na+>Mg2+{O}^{2 –} > {F}^{–} > {Na}^{+} > {Mg}^{2 +}

Step-by-step solution

O2−{O}^{2 -} F−{F}^{-} Na+{Na}^{+} Mg2+{Mg}^{2 +}
ZZ 88 99 1111 1212
No. of e−{e}^{-} 1010 1010 1010 1010

In isoelectronic species greater is ZZ smaller is radius so order is O−2>F−>Na+>Mg2+{O}^{- 2} > {F}^{-} > {Na}^{+} > {Mg}^{2 +}.

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