2. Which amongst the following is not triad? (a) Calcium (40), stronium (87.6), Barium (137.6) (b) Lithium (7.0), Sodium (23.0), Potassium (39.0) (c) Carbon (12.0), Nitrogen (14.0), oxygen (16.0) (d) Chlorine (35.5), Bromine (80.0), Iodine (127.0)
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Answer: (b) - Lithium (7.0), Sodium (23.0), Potassium (39.0)
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