Question

why are ice and steam not called allotropes of water

Answer 1

Allotropes are the different forms of an element .But ice and steam are the different states of water which can be again converted into water ice or steam .so these are not called the allotropes of water

Answer 2

hi friend
these phases of are not allotropes ,since they are caused by changes in the physical bonding between water molecules, rather than changes in the chemical bonding of the molecules themselves. allotropes of an element can be in any state, gases, liquid or solid