what was the defect in Mendeleev periodic table
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Mendeleevs arrangement of elements was based on increasing atomic mass hence elements appeared to be out of place in periodic table
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Defect in Mendeleev periodic table:
- Position of Isotopes
- Position of Hydrogen
- Grouping dissimilar elements
- Anomalous Pairs
Explanation:
Position of Isotopes:
- Isotopes are the substance which have the same atomic number but different mass number.
- Like isotope of hydrogen are Protium, deuterium and tritium.
- These were not given various position in the table.
Position of Hydrogen:
- Hydrogen position was not clear because it has properties similar to both the group 1 and VII group.
Grouping dissimilar elements:
- Elements like copper ,Silver which do not have property similar to group 1 element like Lithium ,sodium were placed in this Group 1.
Anomalous Pairs:
- Cobalt and Tellurium does not follow the Mendeleev periodic table principle.
- Cobalt contains a more eminent atomic mass which is placed before Nickle in the periodic table.
- Tellurium contains a more atomic mass than iodine which is preceded in the table.
Learn more about periodic table
State some characteristics of periodic table
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Mention 4 defects in Mendeleev's periodic table.
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