Hi Saloni,

The limitations of dalton automic theory are as follows:-

• This does not account for subatomic particles.
• This does not account for isotopes.
• This does not account for isobars.
• Elements need not combine in simple, whole-number ratios to form compounds.
• The theory does not account for allotropes

Feel free to ask doubts in the Comment Section.

I hope this information helps you.

Good Luck!