Which position for hydrogen explain all its properties ?

Hydrogen resembles in many of its properties :

Hydrogen resembles in many of its properties with:

What is Nanotechnology ?Explain its properties.

State two main properties of elements on which Mendeleev's periodic classification was based. Why position of hydrogen is not fixed in his periodic table ?

Water a compound of hydrogen is .unique in many of its.properties.Water can act as both acid and base.Explain?

Which periodic table is able to explain properties of element?Write its periodic law and explain the table.

State the assumptions on which a PP curve is based. Also explain its properties. Use diagrame

In which of the following groups, when He is placed, its all the properties are satisfied ?