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5.1 The nuclear model of the atom

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Question 21

The nucleus of radium-226 is represented in nuclide notation as 88226Ra^{226}_{88}\text{Ra}88226​Ra.

a.

State the meaning of the proton number of a nuclide.

[1]
b.

State the value of the proton number of 88226Ra^{226}_{88}\text{Ra}88226​Ra.

[1]
c.

A nucleus of 88226Ra^{226}_{88}\text{Ra}88226​Ra decays by emitting an α\alphaα-particle. It becomes a nucleus of radon (Rn).

State:

  1. the nucleon number of an α\alphaα-particle,
  2. the proton number of an α\alphaα-particle.
[2]
d.

In nuclide notation, the radon nucleus formed is written as YXRn^{X}_{Y}\text{Rn}YX​Rn. State the values of:

  1. X X\,X
  2. YYY
[2]
e.

How many electrons are to be found in a neutral atom of 88226Ra^{226}_{88}\text{Ra}88226​Ra?

[1]
f.

Where in the atom are these electrons to be found?

[1]
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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