11 mark
A number of scientists contributed to the development of the atomic model.
Which of these scientists discovered the electron?
Bohr
Dalton
Rutherford
Thomson
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Atomic Structure (OCR GCSE Chemistry A (Gateway))
Exam Questions
56 mins28 questions21 mark
What is the typical size of the radius of an atom?
10-2 m
10-5 m
10-10 m
10-20 m
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31 mark
Two isotopes of neon are
and 
The two isotopes of neon have different:
Charges
Numbers of electrons
Numbers of neutrons
Numbers of protons
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41 mark
In 1803 John Dalton suggested that all matter is made from atoms.
The electron was the first subatomic particle to be discovered by J.J. Thomson in 1897.
J.J. Thomson developed Dalton’s model to show the presence of electrons.
What was J.J. Thomson’s model called?
Bohr model
Particle model
Planetary model
Plum-pudding model
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51 mark
A sodium atom can be shown as:
How many protons, neutrons and electrons are in a sodium atom?
11 protons, 12 neutrons, 11 electrons
11 protons, 11 neutrons, 12 electrons
12 protons, 12 neutrons, 11 electrons
12 protons, 11 neutrons, 11 electrons
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61 mark
A potassium isotope can be shown as:
What are the numbers of protons, neutrons and electrons in this potassium isotope?
19 protons, 19 neutrons, 20 electrons
19 protons, 20 neutrons, 19 electrons
20 protons, 19 neutrons, 19 electrons
20 protons, 20 neutrons, 19 electrons
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71 mark
Carbon-12 and carbon-14 are isotopes.
Which statement describes isotopes?
Atoms with the same number of protons but a different number of electrons.
Atoms with the same number of electrons but a different number of protons.
Atoms with the same number of protons but a different number of neutrons
Atoms with the same number of neutrons but a different number of protons.
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81 mark
Where is most of the mass found in an atom?
Electrons
Neutrons
Nucleus
Protons
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91 mark
Thomson discovered the first sub-atomic particle.
Which sub-atomic particle did Thomson discover?
Atom
Electron
Neutron
Proton
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1
1 mark
1 markThe atomic structure of an unknown element is shown below.
What is the atomic number and mass number for the unknown element?
| Atomic Number | Mass Number |
A | 6 | 11 |
B | 5 | 11 |
C | 5 | 6 |
D | 6 | 10 |
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21 mark
Niels Bohr was one scientist who contributed to the development of the atomic model.
What was his discovery?
An atom is a ball of positive charge with electrons scattered throughout it
An atom is mainly empty space
Mass is concentrated at the centre of the atom called the nucleus
Electrons exist in shells and orbit the nucleus at specific distances
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31 mark
As the atomic model developed, protons, neutrons and electrons were discovered.
What is the correct order of discovery?
| First | Second | Third |
A | Proton | Neutron | Electron |
B | Proton | Electron | Neutron |
C | Electron | Proton | Neutron |
D | Electron | Neutron | Proton |
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41 mark
Ernest Rutherford's gold-foil experiment involved firing positively charged alpha particles at a thin sheet of gold foil.
One of his observations was that some of the alpha particles bounced straight back off the gold foil.
What did this prove?
The atom is mainly empty space
The atom has a positively charged nucleus
The mass of the atom is concentrated in the nucleus
The positive charges are spread throughout the atom
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51 mark
Chlorine- 35 and chlorine- 37 are isotopes.
Which statement describes an isotope?
Atoms with the same number of protons and different numbers of electrons
Atoms with the same number of neutrons and different numbers of electrons
Atoms with the same number of protons and different numbers of neutrons
Atoms with the same number of neutrons and different numbers of protons
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61 mark
Which statement best describes the structure of an atom?
A nucleus containing protons and neutrons, surrounded by electrons
A nucleus containing protons and electrons, surrounded by neutrons
A nucleus containing electrons and neutrons, surrounded by protons
A nucleus containing protons, surrounded by neutrons and electrons
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71 mark
Whose atomic model was developed first?
JJ Thompson
Ernest Rutherford
John Dalton
Niels Bohr
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81 mark
What is the approximate size of an atom?
3 × 10–1 metres
3 × 10–5 metres
3 × 10–9 metres
3 × 10–13 metres
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91 mark
Niels Bohr was involved in the development of the atomic model.
Which of these statements describes his work?
He developed the idea of a nuclear atom.
He developed the plum-pudding model of the atom.
He stated that atoms were like tiny solid balls.
He stated that electrons exist in fixed energy levels.
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101 mark
When the model of the atom was developed, scientists reviewed the work of other scientists.
Why is it important for scientists to review each other’s work?
They will copy the experiments to complete the research first.
They will evaluate the data and suggest improvements.
They will make sure that personal protective equipment is worn.
They will start an argument about who is correct.
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11 mark
What is the typical size of the radius of a nucleus of an atom?
10-14 m
10-12 m
10-10 m
10-8 m
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21 mark
1 markThe atomic radius of a hydrogen atom is 0.037 nm.
What is the radius in standard form?
3.7 x 10-1
3.7 x 10-2
3.7 x 10-3
3.7 x 10-4
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31 mark
The diagram shows an atom of an element.
What is the name of the element?
Boron
Beryllium
Fluorine
Neon
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41 mark
The charge on an electron is −1.6 × 10−19 C.
What is the charge on a proton?
−1.6 × 1019 C
−1.6 × 10−19 C
1.6 × 10−19 C
1.6 × 1019 C
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51 mark
A sodium atom can be shown as:
Sodium forms the ion Na+.
How many protons, neutrons and electrons are in a sodium ion?
11 protons, 11 electrons, 12 neutrons
10 protons, 10 electrons, 12 neutrons
11 protons, 10 electrons, 12 neutrons
11 protons, 12 electrons, 12 neutrons
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