there are some Vacant place in the Mendeleev periodic table in some of this place the atomic mass are seen to be predicted .enlist three of the predicted atomic mass along with their group and period.
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Mendeleev left some vacant places (shown by question marks) for the yet undiscovered elements. Noble gases were not discovered then. So, he did not provide any place for them in his periodic table.
Mandeleev's idea was remarkable in that he used a fundamental atomic property (atomic mass) as the basis of classification. While classifying elements he laid special emphasis on tow factors.
1. Similar elements were grouped together.
2. Elements were arranged in order of increasing atomic masses.
Mandeleev's idea was remarkable in that he used a fundamental atomic property (atomic mass) as the basis of classification. While classifying elements he laid special emphasis on tow factors.
1. Similar elements were grouped together.
2. Elements were arranged in order of increasing atomic masses.
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