Question

Define the following:-
1). Doberneir Triads
2). Newland Octaves
3). Mendeleev periodic law
4). Modern Periodic law

Answer 1

doberneir triads : element with similar properties were arranged into groups of 3 elements called triads

newland's law of octave: Elements were arranged in the order of increasing atomic mass such that properties of the eighteenth element was the repetition of the properties of the first element

Mendeleev periodic law: the properties of elements are the periodic function of their atomic masses.

Mordern periodic law:the properties of the element are the periodic function of their atomic number.