School text book - Chemistry

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Johann Wolfgang Job Arena was a german scientist who studied pharmacy at munch Berg in Germany and then chemistry at strasbourg. However, Newlands octaves failed because of some drawbacks. Let us discuss them. Let us compare the properties of the predicted element Eca alum in ium E. A, and the element gallium G. A, which was discovered later. Another merit was that when noble gases were discovered later, they could be accommodated in the periodic table in the form of a separate group without disturbing the positions of the other elements. Let us now discuss the similarity between hydrogen and **** logins. Both hydrogen and halogen exist as die atomic molecules hydrogen exists as H two and chlorine, which is a halogen, exists as CL two.