Glass obtained by heating a mixture of sand, lime stone and sodium carbonate is:

The bond formed due to sharing of electrons:

The element having lowest  melting point is:

In galvanization, the metal coated on iron is:

Metallic bond is due to the presence of:

The most stable arrangement of electrons is for :

Mendeleev ' s periodic table was based on :

Silica is:

The structure of methane is:

The most stable arrangement of electrons is for :