JEE Main Chemistry question

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

(A)Li
(B)Mg
(C)Ca
(D)RbCorrect

Answer: (D)

Solution

Ionisation energy decreases down a group and increases across a period. Rb, being both an alkali metal (Group 1, lowest-IE group) and the lowest down the group

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Question ID VK-133265