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5.1 The nuclear model of the atom

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Question 214
a.

The charges on the particles in an atom may be represented by

0or+1or−1 0 \quad \text{or} \quad +1 \quad \text{or} \quad -1 0or+1or−1

The masses of the particles in an atom may be represented by

0ormor2000m 0 \quad \text{or} \quad m \quad \text{or} \quad 2000m 0ormor2000m

Using these choices, complete the table below:

ParticleChargeMasselectron−1mneutronproton\begin{array}{|c|c|c|} \hline \text{Particle} & \text{Charge} & \text{Mass} \\\hline \text{electron} & -1 & m \\\hline \text{neutron} & & \\\hline \text{proton} & & \\\hline \end{array}Particleelectronneutronproton​Charge−1​Massm​​
[2]
b.

How many of each of these particles are there in a neutral atom of Thorium-232, represented as 90232Th^{232}_{90}\text{Th}90232​Th?

  • Number of electrons = ‾\underline{\quad\quad\quad}​
  • Number of neutrons = ‾\underline{\quad\quad\quad}​
  • Number of protons = ‾\underline{\quad\quad\quad}​
[3]
Markscheme

5.1 The nuclear model of the atom Questions

  1. IGCSE
  2. /Physics
  3. /5.1 The nuclear model of the atom

284 exam-style questions on CIE IGCSE Physics 5.1 The nuclear model of the atom, covering 5.1.1a Structure of the atom and ions, 5.1.1b Alpha-particle scattering, 5.1.2a Composition of the nucleus and isotopes, 5.1.2b Proton number, nucleon number and nuclide notation, and 5.1.2c Nuclear fission and nuclear fusion. Each one has a worked solution and a mark scheme showing where the marks go.

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