# Physics AQA A 1.1.1 Inside the atom

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What does Rutherford's alpha-scattering investigations tell us about the structure of an atom?
every atom contains a posiertively charged nucleus composed of protons and neutrons (nucleons). There are also electrons that surround the nucleus.
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How are the electrons held in the nucleus?
By the electrostatic force of attraction between them and the positively charged nucleus.
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What are the charges of a proton, neutron and electron in coulombs, C?.
Proton: +1.6x10^-19C Neutron: 0C Electron: -1.6x10^-19C (where ^ indicates a power i.e. to the power of -19)
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What is the mass of a proton, neutron and electron?
Proton AND Neutron: 1.67x10^-27kg Electron: 9.11x10^-31kg
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What does the atomic number represent?
the number of protons in the elements nucleus (which is equal to the number of its electrons)
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Define the term 'isotope'
Atoms with the same number of protons and different numbers of neutrons. (if the number of protons were different, it would be another element)
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What is the total number of protons and neutrons known as?
the nucleon number or mass number.
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What is each type of nucleus known as?
a nuclide. i.e. a nuclide of the carbon-12 isotope has two fewer neutrons and 2 fewer protons than the nuclide of the oxygen isotope.
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How is the specific charge of a charged particle calculated?
Charge divided by its mass. For example, the electron has a charge of -1.6x10^-19C and a mass of 9.11x10^-31kg, therefore has a specific charge of 1.76x10^11C/kg
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## Other cards in this set

### Card 2

#### Front

How are the electrons held in the nucleus?

#### Back

By the electrostatic force of attraction between them and the positively charged nucleus.

### Card 3

#### Front

What are the charges of a proton, neutron and electron in coulombs, C?.

### Card 4

#### Front

What is the mass of a proton, neutron and electron?

### Card 5

#### Front

What does the atomic number represent?