Newlands proposed the law of octaves . Mendeleeff suggested eight groups for elements in his table . How do you explain these observations in terms of modern periodic classification ?

Explanation

1 ) According to Newlands , every eighth element starting from a given element resembles in its properties to that of the starting element . When elements are arranged in ascending order of their atomic weights .
2) According to Newlands , the properties of fluourine and chlorine are similar and sodium and potassium are similar . same aspect is given by modern periodic table .
3 ) Mendeleeff divded if into horizontal rows and vertical columns . He called them as periods and groups respectively . modern periodic table also gives the same .
4 ) Accoding to mendeleeff, the elements of same group have similar properties.Modern periodic table also proposed the same thing .
5 ) Mendeleeff gave the general formula for first group elements as `R_(2) O ` and general formula for second group elements as RO . We can find the same thing in modern periodic table .
6 ) the elements of particular group posses same common valency . same was proposed by modern periodic table .