With these breakthroughs, Mendeleev could not move further as the Rutherford-Bohr model of the atom was yet to be discovered.Īfter about four decades, Henry Moseley in 1913 showed the atomic number (charge) and not the atomic weight, as proposed by Mendeleev, as the fundamental chemical property of any element. It was Mendeleev, who predicted undiscovered elements like eka-silicon (as he found a gap between silicon and tin), today known as germanium, gallium, today called aluminum, and eka-boron, known as scandium. He got a table with gaps and spaces, which meant that there were further elements yet to be discovered. The ones with similar properties were kept in the same column.He positioned element with higher atomic weights on the left side.He arranged the elements in his table on the basis of the following points: Mendeleev found out that 65 elements that were known in his time, could be arranged in a grid. There were many versions introduced before Mendeleev’s table, but he was the one who illustrated the recurring periodic trends in the elemental properties. They follow a pattern, i.e., in an increasing order of the atomic number.ĭmitri Mendeleev, a Russian chemist, is credited as the first person to invent the periodic table in 1869. These elements are arranged in rows and columns – left to right and top to bottom. The elements arranged in the periodic table are great help to scientists, chemists, scholars, researchers, and even students in understanding their various properties and characteristics at a glance.
The periodic table is one of the most important points of reference in the branch of chemistry, and is often known as the Bible of chemical sciences.
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