Explain why hydrogen is best placed separately in the periodic table.

Explain why hydrogen is not placed with the halogen in the periodic table.

Why is hydrogen placed separately above group 1 in the periodic table ?

Explain why H can be placed in gr-1 and gr-17 in the periodic table.

Why should hydrogen be assigned a separate position in the periodic table?

The lanthanides are placed in the periodic table at

The two isotopes of chlorine have atomic mass 35 u and 37 u. Should they be placed in separate slots in the periodic table ?

Explain why isobars are placed at different places in periodic table?