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Discarding Models

APCHEM-AJXMSN

What evidence led scientists to discard the plum-pudding model of the atom (random arrangement of positive and negative charge) and adopt a model with a tiny, dense, positively charged nucleus?

A

A cathode ray bent towards a positively charged electric plate.

B

Emission spectra lines only showed red, green, blue, and violet for the element hydrogen.

C

Very few alpha particles were deflected when shot at gold foil.

D

Mathematical models plotted the different shaped orbitals: s, p, d, and f.