Mendeleev's periodic table important points plss
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Mendeleev's periodic table:
1)It is based on atomic weights.
2)Mendeleev's periodic law:The physical and chemical properties are periodic function of their atomic weights.
3)Only 63 elements were known at that time.
4)It has 8 vertical columns called groups .
5)7 horizontal rows known as periods.
6)Order of atomic weights was changed at places to justify properties of an element.
7)It had vacant places which were discovered later.
Example: eka aluminium (gallium), eka silicon ( germanium)
Mendeleev's periodic table:
1)It is based on atomic weights.
2)Mendeleev's periodic law:The physical and chemical properties are periodic function of their atomic weights.
3)Only 63 elements were known at that time.
4)It has 8 vertical columns called groups .
5)7 horizontal rows known as periods.
6)Order of atomic weights was changed at places to justify properties of an element.
7)It had vacant places which were discovered later.
Example: eka aluminium (gallium), eka silicon ( germanium)
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