Question

why are hexa fluoride stable then di and tri fluoride

Answer 1

Hexa fluoride is contains less water content that them

Answer 2

Difluoride

Example, Beryllium difluoride

Two fluorine atoms occupy around the Beryllium atom .

Trifluoride

Example , aluminium trifluoride

Trifluoride are compounds having three fluorines per formula unit .

Hexafluoride

Example , ruthenium hexafluoride

Six fluorines fit around the ruthenium atom .

Thus making hexafluoride more stable than difluoride and trifluoride .