Can I have some help please c:
How did John Dalton order the elements?

Well his original list showed only five elements: hydrogen, oxygen, azote (nitrogen), carbon and sulfur, along with their atomic weights

I hope this helps you :)

alchemy hadn't scientific methods of study, appeal to mysticism and fantasy, the knowledge of chemistry and physics were modest at that time.

alchemy was - but as new rules were discovered it either changed into chemistry or it became "unscientific".