Question

limits of modern periodic table​

Answer 1

(a) Position of hydrogen: It could not assign a correct position to hydrogen in the table.

(b) The lanthanides and actinides are not placed in the main body of the table.

(c) Position of isotopes: There are no separate positions for isotopes of an element.

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Answer 2

Periodic table elements are150 years old of chemic elements in is still growing in2016 for new elements with atomic numbers 113,115,117and 118 were aded to its nihonium,moscovium,tennsine,oganesion