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5.1 The nuclear model of the atom

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Question 141
a.

Use words from the box to complete the sentences about the charges in an atom. Words can be used once, more than once or not at all.

negative, neutral, positive \text{negative, neutral, positive} negative, neutral, positive
  • The charge on the nucleus of an atom is _____________________
  • The charge on a neutron is _____________________
  • The charge on electrons orbiting the nucleus is _____________________
[3]
b.

A nucleus of cesium-137 has the nuclide notation:

55137Cs {}^{137}_{55}\text{Cs} 55137​Cs

Determine the number of protons in a nucleus of cesium-137.

[1]
c.

Determine the number of neutrons in a nucleus of cesium-137.

[1]
d.

Cesium has another isotope, cesium-135. Write the nuclide notation for cesium-135.

[1]
e.

Cesium-137 has a half-life of 30 years.

A sample contains 48 mg48\text{ mg}48 mg of cesium-137.

Calculate the time for the sample to decay until only 6.0 mg6.0\text{ mg}6.0 mg of cesium-137 remains.

[2]
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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