3.1 .Development of periodic table

He creaton the groups that were known as Dobereiner’s Triad

Johann Wolfgang Dobereiner

He noticed that certain group of elements having similar properties seem to come in groups of three. What do you call that Three Groups?

Dobereiner’s Triad

How many triads were successfuly classified?

3

Who reported the law of octaves

Johann Alexander Reina Newlands

What law did Johann Alexander Reina Newlands reported?

Law of octaves

Who is the father of periodic table?

Dmitri Mendeleev

Who established the periodicity of elements based on their physical properties or atomic value

Julius Lothar Meyer

Who used the element’s chemical properties to establish the pattern

Dmitru Mendeleev

He used the number rather than atomic mass in arranging the elements. He firmly established the relationship between atomic number and the change of the atomic nucleus and he predicted the existance of the four new elements.

Henry G.J. Mosely