Which of the following was the big surprise in the classic gold foil experiments of Rutherford, Geiger and Marsden:
W) alpha particles sometimes disappeared
X) electrons would not penetrate the nucleus
Y) the atom was mostly space as supported by the finding that most alpha particles continued on a straight path and hit the rear of the detection screen
Z) some alpha particles left evidence of having returned almost straight back to hit the front part of the detection screen
✔️Answer:Z) SOME ALPHA PARTICLES LEFT EVIDENCE OF HAVING RETURNED ALMOST STRAIGHT BACK TO HIT THE FRONT PART OF THE DETECTION SCREEN
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