Why was the theory of the atom so controversial back in the early 1900's?

Answer : The theory of atom was controversial in early 1900's because people still thought that things can continue to be further divided and sub-divided.

This was the opinions of the people during early 1900's which created controversies from the theory proposed. Back in minds of people it was hard for them to believe that atoms were the smallest part present in any matter. When it was proved with several other supporting theories in late 1900's people started to believe the theory of atoms.

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explanation:

two years ago, when picking flowers in the mountains back of yosemite valley, i found a book. it was blotted and storm-beaten; all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however; many of the inner pages were well preserved. and although all were more or less stained and torn, whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today; its granite pages have been torn and blurred by the same storms that wasted the castaway book.

two years ago, when picking flowers in the mountains back of yosemite valley; i found a book. it was blotted and storm-beaten, all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however, many of the inner pages were well preserved. and although all were more or less stained and torn; whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today, its granite pages have been torn and blurred by the same storms that wasted the castaway book.