49. Which of the following set of elements obeys
newland's octave rule
1) Na, K, Rb
2) F, CI, Br
3) Be, Mg, Ca
4)B, Al, Ga
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Answer:
Correct option is 3)
Explanation:
Be, Mg, Ca follows Newland's octave rule.
According to Newland's octave rule, if the chemical elements are arranged according to increasing atomic weight, those with similar physical and chemical properties occur after each interval of seven elements.
•After calcium, every eighth element did not possess properties similar to that of the first.
•Newland’s Law of Octaves was applicable up to calcium only. Elements after Calcium did not obey Newland’s Law of Octaves.
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