State Newlands‘ Law of Octaves.
Newland’s Law of Octaves:-
When elements are arranged in the increasing order of atomic masses, the properties of every eighth element are similar to the first.
If elements are arranged in order of increasing atomic masses, the properties of every eighth element is a kind of repetition of first on, just like the notes of music
Li, Be, B, C, N, O, F, Na
(1) (2) (3) (4) (5) (6) (7) (8)
The first element (Li) and 8th element (Na) have similar properties.