MPSC Rajyaseva 2018 GS Paper 1 — Question 50
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'M' हे मूलद्रव्य डोबेरीनर त्रिके मध्ये Ca, M आणि Ba हे ________ आहे. / The element M in the Dobereiner triad Ca, M and Ba is ________
1)Be
2)Mg
3)Sr✓ Correct
4)I
In Dobereiner's triads, elements with similar properties were grouped in threes where the atomic mass of the middle element is approximately the mean of the other two. For the triad Calcium (Ca), Strontium (Sr), and Barium (Ba), Strontium (Sr) is the middle element.
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