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what is the mean of the statement in the attachement?

what is the mean  of the statement in the attachement?

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Grade:12

1 Answers

Arun
25750 Points
6 years ago
Dear Praveen
 
thease are the defects of modern periodic table:
 Position of hydrogen still dicey. It is not fixed till now.
 Position of lanthanides and actinides has not been given inside the main body of periodic
table.
 It does not reflect the exact distribution of electrons of some of transition and inner transition
elements.

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