why do we classify elements? what are the two criteria used in the development of modern periodic table.
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That's why we classify elements. B. Mendeleev used atomic mass and similarities in chemical properties to classify the elements. ... Mendeleev predicted the existence of some elements in the periodic table which were not discovered at that time, so he left the place for those elements in the periodic table.
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Due to discovery of different elements , it was difficult to organize the information and properties of the elements , so there was a strong need to find some pattern in the properties of different elements so that they can be grouped . That's why we classify elements .
The two criterias are:- 1) Atomic number of the elements. 2) Periodicity of the elements.
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