Explain the contribution of Newlands to the periodic table.

(N/A) John Alexander Newlands in $1865$ proposed the Law of Octaves.
- Law: "Every eighth element has properties similar to the first element."
- The relationship is analogous to the musical scale,where every eighth note resembles the first. For his work,he was later awarded the Davy Medal in $1887$ by the Royal Society,London.

Element	$Li, Be, B, C, N, O, F$
At. wt.	$7, 9, 11, 12, 14, 16, 19$
Element	$Na, Mg, Al, Si, P, S, Cl$
At. wt.	$23, 24, 27, 29, 31, 32, 35.5$
Element	$K, Ca$
At. wt.	$39, 40$