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1.1 A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes

1.1 A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes

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Question 24

This question is about atomic structure.

a.

Atoms contain subatomic particles. Table 1 shows properties of two subatomic particles. Complete Table 1:

  • neutron: Relative mass = [ ], Relative charge = [ ]
  • [ missing name ]: Relative mass = 11840\frac{1}{1840}18401​ (or negligible), Relative charge = −1-1−1
[2]
b.

Define mass number.

[1]
c.

Two naturally occurring isotopes of magnesium are 24Mg^{24}\text{Mg}24Mg and 26Mg^{26}\text{Mg}26Mg. Why do these isotopes have the same chemical properties?

[1]
d.

The model of the atom changed as new evidence was discovered. Describe the differences between the nuclear model of the atom and the plum pudding model.

[4]
Markscheme

1.1 A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes Questions

  1. GCSE
  2. /Chemistry
  3. /1.1 A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes

41 exam-style questions on AQA GCSE Chemistry 1.1 A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes, covering 1.1.1 Atoms, elements and compounds, 1.1.2 Mixtures, 1.1.3 The development of the model of the atom (common content with physics), 1.1.4 Relative electrical charges of subatomic particles, 1.1.5 Size and mass of atoms, 1.1.6 Relative atomic mass, and 1.1.7 Electronic structure. Each one has a worked solution and a mark scheme showing where the marks go.

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