Question

explain what is dobereiner's triad? newlands law of Octave?
mendel's periodic table ?explain the modern form of periodic table ?​

Answer 1

Answer:

Newland's Law of Octaves states that " when elements are arranged in increasing order of their atomic weights , they form groups of eight in which the properties of the first element is similar to the properties of the eighth element which is the same as that of a musical note ".

Mendeleev's periodic table is based on atomic mass. Modern periodic table is based on atomic number. ... In Mendeleev's periodic table noble gases were not placed (as they are not discovered at that time). In Modern periodic table noble gases in a seperate group as group 18