state any tree limitation of mendelee,s classification
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1. Position of hydrogen was not specified.
2. Problem of placing Isotopes and isobars.
3. His periodic table was based on the atomic masses rather than atomic number.
2. Problem of placing Isotopes and isobars.
3. His periodic table was based on the atomic masses rather than atomic number.
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Heya,
Limitations of Mendeleev's Periodic Table
1) Anomalous pairs of elements : Some elements of higher atomic weight were placed before the elements of lesser atomic weight.
2) Position of elements of group VIII : Elements of group VIII were arranged in triads but no fixed position was alloted to them, in periodic table.
3) Position of isotopes : Isotopes are of same elements with same atomic number but different atomic masses.
Mendeleev classified the elements according to atomic masses so all isotopes of an element should be given different positions but this was not done by Mendeleev in his periodic table.
4) Placement of similar elements at different positions and dissimilar elements at same position : Alkali metals were kept together with coinage metals (Cu, Ag and Au) although their properties were different and similarly, the Cu and Hg (show some similar properties) were kept separate from each other in Mendeleev’s periodic table.
5) Anomalous position of hydrogen : Hydrogen show properties like both of metals and non-metals (i.e.properties like elements of I(A) group and some properties like that of elements of VII(A) group) so its position in I(A) group was controversial.
Hope this helps...:)
Limitations of Mendeleev's Periodic Table
1) Anomalous pairs of elements : Some elements of higher atomic weight were placed before the elements of lesser atomic weight.
2) Position of elements of group VIII : Elements of group VIII were arranged in triads but no fixed position was alloted to them, in periodic table.
3) Position of isotopes : Isotopes are of same elements with same atomic number but different atomic masses.
Mendeleev classified the elements according to atomic masses so all isotopes of an element should be given different positions but this was not done by Mendeleev in his periodic table.
4) Placement of similar elements at different positions and dissimilar elements at same position : Alkali metals were kept together with coinage metals (Cu, Ag and Au) although their properties were different and similarly, the Cu and Hg (show some similar properties) were kept separate from each other in Mendeleev’s periodic table.
5) Anomalous position of hydrogen : Hydrogen show properties like both of metals and non-metals (i.e.properties like elements of I(A) group and some properties like that of elements of VII(A) group) so its position in I(A) group was controversial.
Hope this helps...:)
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