Question

mendeleev periodic table ​

Answer 1

This periodic table was given by Dmitri Mendeleev, a Russian chemist in 1869.

Explanation:

• This periodic table is the basis of Modern Periodic Table.
• He placed the elements according to their increasing number of atomic masses, and also placed the elements in certain groups because of their similar chemical behaviour.
• He conducted reactions on the hydride and oxides of several elements, and placed elements showing similar properties in one group.
• He predicted about the discovery of newer elements, like he predicted an element having similar properties of Aluminium and called it Eka- Aluminium,later Gallium was discovered.
• With the placing of elements he relied mainly on the chemical properties rather than the atomic masses.
• For example, Iodine has lower weight than Tellurium but Iodine showed common properties with flourine, chlorine, iodine, etc. was placed with flourine, chlorine, etc.
• Although there was many problems in this table, it cannot be denied because it was one of the first attempts in categorizing it and was widely accepted for a very long time, till the coming of the Modern Periodic Table.

Answer 2

Answer:

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