AQA Chemistry A-Level
- Atomic Structure QP
Study Guide & Marking
Scheme 2025 | 100%
Correct
,Draw a labelled diagram of the structure of an atom. (3)
What is the relative mass of a proton? (1)
1
What is the relative charge of a proton? (1)
1
What is the relative mass of a neutron? (1)
1
What is the relative charge of a neutron? (1)
0
What is the relative mass of an electron? (1)
The relative mass of an electron is 1/1840.
, What is the relative charge of an electron? (1)
-1
Where are protons and neutrons positioned within an atom? (1)
Within the nucleus of the atom.
Where are electrons positioned within an atom? (1)
Electrons are located in orbitals within subshells around the nucleus of an atom.
What are isotopes? (2)
- Isotopes are atoms of the same element with the same number of protons.
- They have different mass numbers due to varying numbers of neutrons.
What are the physical and chemical properties of isotopes? (2)
- Isotopes have slightly different physical properties because of their different masses.
- They exhibit similar chemical properties since they have the same electronic configuration.
What was John Dalton's early model of the atom? (2)
- In the early 19th century, John Dalton described atoms as solid spheres.
- He suggested that different spheres represented different elements.
What was J. J. Thomson's contribution to atomic structure? (2)
- In 1897, J. J. Thomson discovered the electron.
- This showed that atoms were not solid and indivisible, leading to the 'plum pudding model' of
a positively charged sphere containing electrons.
What was Rutherford's gold foil experiment? (4)
1. In 1909, Rutherford and his students Geiger and Marsden fired positively charged alpha
particles at a very thin sheet of gold.
2. Most alpha particles passed straight through, showing that most of the atom is empty space.
3. A few particles were deflected strongly, suggesting a small, dense, positively charged nucleus.
- Atomic Structure QP
Study Guide & Marking
Scheme 2025 | 100%
Correct
,Draw a labelled diagram of the structure of an atom. (3)
What is the relative mass of a proton? (1)
1
What is the relative charge of a proton? (1)
1
What is the relative mass of a neutron? (1)
1
What is the relative charge of a neutron? (1)
0
What is the relative mass of an electron? (1)
The relative mass of an electron is 1/1840.
, What is the relative charge of an electron? (1)
-1
Where are protons and neutrons positioned within an atom? (1)
Within the nucleus of the atom.
Where are electrons positioned within an atom? (1)
Electrons are located in orbitals within subshells around the nucleus of an atom.
What are isotopes? (2)
- Isotopes are atoms of the same element with the same number of protons.
- They have different mass numbers due to varying numbers of neutrons.
What are the physical and chemical properties of isotopes? (2)
- Isotopes have slightly different physical properties because of their different masses.
- They exhibit similar chemical properties since they have the same electronic configuration.
What was John Dalton's early model of the atom? (2)
- In the early 19th century, John Dalton described atoms as solid spheres.
- He suggested that different spheres represented different elements.
What was J. J. Thomson's contribution to atomic structure? (2)
- In 1897, J. J. Thomson discovered the electron.
- This showed that atoms were not solid and indivisible, leading to the 'plum pudding model' of
a positively charged sphere containing electrons.
What was Rutherford's gold foil experiment? (4)
1. In 1909, Rutherford and his students Geiger and Marsden fired positively charged alpha
particles at a very thin sheet of gold.
2. Most alpha particles passed straight through, showing that most of the atom is empty space.
3. A few particles were deflected strongly, suggesting a small, dense, positively charged nucleus.
