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Question
Find the odd one out and give its explanation.
Options
Beryllium
Helium
Neon
Argon
MCQ
Odd One Out
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Solution
Beryllium.
Explanation:
Helium, neon, and argon are all noble gases belonging to Group 18 of the periodic table, characterised by their stable, completely filled valence electron shells. Beryllium, however, belongs to Group 2, which are the alkaline earth metals, making it much more reactive than the inert noble gases.
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