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5.1.1a Structure of the atom and ions

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Question 37

In the α\alphaα-particle scattering experiment, a beam of α\alphaα-particles is directed at a thin metal foil. The following two observations are made:

  • Observation 1: The vast majority of the α\alphaα-particles pass straight through the foil with little to no deflection.
  • Observation 2: A tiny fraction of the α\alphaα-particles are deflected through angles greater than 90∘90^\circ90∘.

Which of the following options correctly identifies the conclusions about atomic structure derived from these observations?

A

Observation 1 leads to: The nucleus contains neutrons. Observation 2 leads to: Most of the atom is empty space.

B

Observation 1 leads to: Most of the atom is empty space. Observation 2 leads to: Most of the mass and positive charge of the atom are concentrated in a tiny, dense nucleus.

C

Observation 1 leads to: Most of the mass and positive charge of the atom are concentrated in a tiny, dense nucleus. Observation 2 leads to: Most of the atom is empty space.

D

Observation 1 leads to: Electrons orbit the nucleus in specific shells. Observation 2 leads to: The nucleus has a negative charge.

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5.1.1a Structure of the atom and ions Questions

  1. IGCSE
  2. /Physics
  3. /5.1.1a Structure of the atom and ions

114 exam-style questions on CIE IGCSE Physics 5.1.1a Structure of the atom and ions. Each one has a worked solution and a mark scheme showing where the marks go.

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