Question

Name for defects of Maldeleev's periodic table....¿¿​

Answer 1

What are the defects in Mendeleev periodic table? The following pairs of elements did not follow Mendeleev's Principles: Cobalt (58.9) with higher atomic mass precedes Nickel (58.6) in the periodic table. Tellurium (127.6) with higher atomic mass than Iodine (126.9) is also placed before it in the periodic table.

Answer 2

Answer:

1-position of hydrogen

2-anomolous pairs

3-position of isotopes

4-cause of periodicity

5-position of lanthanoida and actinoids