Question

18. (m) How were the positions of isotopes of an element decided in the modern periodic tal
(b) How were the positions of cobalt and nickel resolved in the modern periodic table?
(C) Where should hydrogen be placed in the modern periodic table ? Give reason for​

Answer 1

Answer:

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Explanation:

A. Modern periodic table is arranged in the increasing order of atomic numbers. Isotopes are atoms of same element having different atomic mass, but the same atomic number. Isotopes have not been given seprate

place in the modern periodic table they are placed at the same place as their atomic numbers are same.

B.According to modern periodic law, elements are arranged in the order of increasing atomic numbers. ... In this way, the positions of cobalt and nickel were resolved in the modern periodic table.

C.Hydrogen is placed in 1st group which belongs to alkali metal because it has a Valence electron and it acts as an alkali metal.