Question

Write short note in mandelevee's periodic table.​

Answer 1

Explanation:

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Answer 2

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✒ Short Note on Mandelevee's Periodic Table

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• In 1863, there were 56 known elements with a new element being discovered at a rate of approximately one per year.
• Other scientists had previously identified periodicity of elements.
• John Newlands described a Law of Octaves, noting their periodicity according to relative atomic weight in 1864, publishing it in 1865.
• His proposal identified the potential for new elements such as germanium.
• The concept was criticized and his innovation was not recognized by the Society of Chemists until 1887.
• Another person to propose a periodic table was Lothar Meyer, who published a paper in 1864 describing 28 elements classified by their valence, but with no predictions of new elements.

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✒ About Dmitri Mendeleev

• Dmitri Ivanovich Mendeleev was a Russian chemist and inventor.
• He is best remembered for formulating the Periodic Law and creating a farsighted version of the periodic table of elements.
• He used the Periodic Law not only to correct the then-accepted properties of some known elements.
• Such as the valence and atomic weight of uranium, but also to predict the properties of eight elements that were yet to be discovered.

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