Question

The timeline I find very good, I will make him brainliest and will give 30pts

Answer 1

hey buddy, here is your answer... Finally in the year of 1868, the modern periodic table was formed and many elements were not yet discovered...

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Answer 2

THE HISTORY ABOUT THE PERIODIC TABLE

The periodic table is an arrangement of the chemical elements, which are organized on the basis of their atomic numbers, electron configurations and recurring chemical properties. Elements are presented in order of increasing atomic number. The standard form of the table consists of a grid with rows called periods and columns called groups.

The periodic table is an arrangement of the chemical elements, which are organized on the basis of their atomic numbers, electron configurations and recurring chemical properties. Elements are presented in order of increasing atomic number. The standard form of the table consists of a grid with rows called periods and columns called groups.The history of the periodic table reflects over two centuries of growth in the understanding of the chemical and physical properties of the elements, with major contributions made by Antoine-Laurent de Lavoisier, Johann Wolfgang Döbereiner, John Newlands, Julius Lothar Meyer, Dmitri Mendeleev, Glenn T. Seaborg, and others.

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In 1863 English chemist John Newlands divided the then discovered 56 elements into 11 groups, based on characteristics. In 1869 Russian chemist Dimitri Mendeleev started the development of the periodic table, arranging chemical elements by atomic mass. ... They discovered that beta particles were negatively charged.