Given below are two statements, one is labelled as Statement I and the other is labelled as Statement II. Statement I : The metallic radius of Na is 1.86\, AA and the ionic radius of Na + is less than 1.86\, AA . Statement II : Ions are always smaller in size than the corresponding elements. In the light of the above statements, choose the correct answer from the options given below :

Both Statement I and Statement II are correct

Both Statement I and Statement II are incorrect

Statement I is incorrect but Statement II is correct

Chemistry · Periodicity of Elements and Periodic Properties

JEE Main 2024 — 5 April, Shift 2 — Question 70

Given below are two statements, one is labelled as Statement I and the other is labelled as Statement II.

Statement I : The metallic radius of Na is $1.86\,\mathrm{\AA}$ and the ionic radius of Na $^+$ is less than $1.86\,\mathrm{\AA}$ .

Statement II : Ions are always smaller in size than the corresponding elements.

In the light of the above statements, choose the correct answer from the options given below :

Option A:
Statement I is correct but Statement II is incorrect
Correct
Option B:
Both Statement I and Statement II are correct
Option C:
Both Statement I and Statement II are incorrect
Option D:
Statement I is incorrect but Statement II is correct

Answer: A

Step-by-step solution

Statement I is Correct: The metallic radius of sodium is $1.86\,\text{\AA}$ . On formation of $(\mathrm{Na^+})$ , sodium loses one electron, which increases the effective nuclear charge per electron and causes contraction of size; hence, the ionic radius of $\mathrm{Na^+}$ is smaller than $1.86\,\text{\AA}$ .

Statement II is Incorrect: Ions are not always smaller than their parent atoms; cations are smaller due to loss of electron(s), whereas anions are larger because of gain of electron(s) and increased electron–electron repulsion.

Thus, statement I is correct but statement II is incorrect.

Answer key and solution verified before publishing.

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Exam: JEE Main 2024
Paper: 5 April, Shift 2
Subject: Chemistry
Chapter: Periodicity of Elements and Periodic Properties
Topic: Periodicity in Physical Properties (shielding and sizes)