10. Answer briefly VII

 

Ionic compounds are crystalline gaseous vapoursliquidssolids at room temperature.

It has rarehigh moderatelow melting and boiling point.

Covalent compounds occurs in gaseous vapoursliquidssolids state.
Have relatively lowhigh raremoderate melting point.

 

 

Noble gases have a non-stable stable minimummeta-stable valence electronic configuration. So noble gas atoms neither have any tendency to gain nor lose electrons and their valency is eight onezerotwo. Thus they are said to be inert.