Chemistry class XII Chapter 1

NEWLAND'S LAW OF OCTAVES

In 1864 an English chemist Newland arranged the elements in the ascending order of their atomic weights . He observed that :

" The properties of every eighth element is similar to that of the first  ".

He called this regularity of elements as the law of octaves.

                               Li        BE        B      C      N     O       F

                              Na       Ma       Al      Si     P     S      Cl

ADVANTAGES OF LAW OF OCTAVES :

1- This law provided a basis for the classification of elements into groups having similar properties.

2- The law provided a scope to arrange all the elements into Tabular form.

DISADVANTAGES OF LAW OF OCTAVES :

1- Newland's law was only applicable for the first seventeen elements and broken down afterward e.g first two rows and three columns obey the law.

2- This arrangement did not include noble gases and heavy elements.