Question

Write anomalies of modern periodic table ?

Answer 1

position of hydrogen is not fixed
lanthanides and actinides are placed outside the table

Answer 2

Anomalies of modern periodic table are:
(i) Position of Hydrogen is not fixed.
(ii) Lanthanoids and Actinoids are placed outside the periodic table in two separate columns.
(iii) Position of isotopes is not fixed.
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