define mendeleev's periodic table? what are the achievement of Mendeleev? write it's demerits
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The properties of this element are periodic functions of their atomic mass
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The properties of the elements are the periodic functions of their atomic weights.
- His periodic table had 8 groups and 7 periods
- Division of elements into groups and periods (systematic division)
- Correction of few atomic weights
- Predicting the properties of missing elements like scandium and gallium
- Anomalous pairs of elements - Mendeleev placed elements with higher atomic weights before lower ones, Ex : Te and I
- Dissimilar elements placed together - Elements with dissimilar properties were placed in same groups like IA and IIA have small resemblance
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