What is 50000000000000,00000000000000000000 00 times 700000000000000000000000,0000000 just a whole bunch of numbers

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(5 x 10³⁶) · (7 x 10³¹) = 3.5 x 10⁶⁸

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.