Question

list one advantage and one limitation of Debonair newland Mendeleev periodic table

Answer 1

he has made traids... in which the average atomic mass of one atom was equal to that of other.... but at some cases the rule was not satisfied

Answer 2

Dobereiners traid are-

1.It state that when three elements in traid were arranged in the increasing atomic mass,the atomic mass of themiddle element was roughly the average of the atomic masses of the other two elements

Limitation

He fails to classify all the elements

Newland

It states that if elements are arranged in the order of increasing atomic mass than the first and the 8th element have same properties

Limitation

1 no place for noble gas

2 it is applicable fot first twenty elements

Mendleave periodic law

States That The properties of elements are in the periodic function of atomic mass

Limitation

Few anomalies could not be explainedon the basis of this table like

1 position of hydrogen,position of isotopes,uncertainity in atomic mass,placing of haveir elements before the lighter one

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