MHT CET 2024 Chemistry question

Which of the following elements belongs to first group and fifth period of periodic table?

Answer: (A)

Solution

Group 1 elements are the alkali metals: Li (period 2), Na (3), K (4), Rb (5), Cs (6). Rubidium (, Z = 37) has its valence electron in the 5th shell,

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Question ID VK-093233