Which of the following elements will have the lowest first ionisation energy?

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Which of the following elements will have the lowest first ionisation energy?

Options

(a) Li
(b) Mg
(c) Ca
(d) Rb

Correct Answer:

Rb

Explanation:

Rb belongs to I-A group and has maximum size. Hence, has lowest IE₁.

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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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