Q.X and Y are the two elements having similar properties which obey Newland's law of octaves.how many elements are there in-between X and Y.

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Solution

According to Newland's Law of Octave, When we arrange elements with increasing atomic weight we get that every eighth element are similar.
It means if elements X and Y have similar properties then they have six(6) elements in between the two.
For ex, if Li is X and Na is Y with similar properties then arranging with Newlands law;
series 1. Li ,Be(1), B(2), C(3), N(4), O(5) ,F(6)
series 2 . Na . will be the arrangement

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