Q18 of 181 Page 282

Where should hydrogen be placed in the modern periodic table ? Give reason for your answer.

Hydrogen is placed in 1^st group which belongs to alkali metals because it has a valence electron and it acts as an alkali element.

How were the positions of isotopes of an element decided in the modern periodic table ?

How were the positions of cobalt and nickel resolved in the modern periodic table ?

On which side of the periodic table will you find metals ?

On which side of the periodic table will you find non-metals ?