Which of the following is the smallest in size?

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Which of the following is the smallest in size?

Options

(a) Na⁺
(b) F⁻
(c) O²⁻
(d) N³⁻

Correct Answer:

Na⁺

Explanation:

Na⁺ < F⁻ < O²⁻ < N³⁻. All are isoelectronic, effective nuclear charge is highest for Na⁺, so it has smallest size.

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Question Type: Memory (964)
Difficulty Level: Easy (1008)
Topics: Classification of Elements and Periodicity (94)
Subject: Chemistry (2512)

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