GCSE AQA SCIENCE CHEMISTRY EXAM
REVIEW ACCURATE QUESTIONS AND
CORRECT VERIFIED ANSWERS GUARANTEED
PASS 2026
◉What are the masses and charges of these parts of an atom?
• Proton
• Neutron
• Electron . Answer: Protons = +ve
(mass 1)
Neutrons = neutral
(mass 1)
Electrons = -ve
(mass 1/2000th)
◉Why do atoms usually have no overall electrical charge? . Answer:
Atoms usually have no overall charge because they have equal numbers
of protons (+ve) and electrons (-ve), which cancel one another out
,◉All atoms of a particular element (e.g. carbon) all have the same
number of what? . Answer: Protons
◉What does relative atomic mass tell you about the atom? . Answer:
The number of protons and neutrons in the atom
◉What does atomic number tell you about the atom? . Answer: The
number of protons (usually the same as the number of electrons)
◉What is an isotope? . Answer: An isotope is an atom with a different
amount of neutrons
◉How many electrons can occupy the 1st and 2nd shell (energy level)
of an atom? . Answer: 2 in the 1st shell and 8 in the 2nd shell
◉The electron structure of sodium can be represented as 2,8,1 - what
does this mean?
Represent these atoms: -
• Fluorine
• Oxygen
• Potassium
• Magnesium . Answer: 2,8,1 means 2 electrons in the 1st shell, 8
electrons in the 2nd shell and 1 electron in the 3rd shell
, Fluorine = 2,7
Oxygen = 2,6
Potassium = 2,8,8,1
Magnesium = 2,8,2
◉Define these terms: -
• Element
• Compound
• Mixture . Answer: Element - a pure substance made from 1 type of
atom only
Compound - 2 or more elements chemically bound
Mixture - 2 or more elements or compounds mixed together which are
not chemically bound
REVIEW ACCURATE QUESTIONS AND
CORRECT VERIFIED ANSWERS GUARANTEED
PASS 2026
◉What are the masses and charges of these parts of an atom?
• Proton
• Neutron
• Electron . Answer: Protons = +ve
(mass 1)
Neutrons = neutral
(mass 1)
Electrons = -ve
(mass 1/2000th)
◉Why do atoms usually have no overall electrical charge? . Answer:
Atoms usually have no overall charge because they have equal numbers
of protons (+ve) and electrons (-ve), which cancel one another out
,◉All atoms of a particular element (e.g. carbon) all have the same
number of what? . Answer: Protons
◉What does relative atomic mass tell you about the atom? . Answer:
The number of protons and neutrons in the atom
◉What does atomic number tell you about the atom? . Answer: The
number of protons (usually the same as the number of electrons)
◉What is an isotope? . Answer: An isotope is an atom with a different
amount of neutrons
◉How many electrons can occupy the 1st and 2nd shell (energy level)
of an atom? . Answer: 2 in the 1st shell and 8 in the 2nd shell
◉The electron structure of sodium can be represented as 2,8,1 - what
does this mean?
Represent these atoms: -
• Fluorine
• Oxygen
• Potassium
• Magnesium . Answer: 2,8,1 means 2 electrons in the 1st shell, 8
electrons in the 2nd shell and 1 electron in the 3rd shell
, Fluorine = 2,7
Oxygen = 2,6
Potassium = 2,8,8,1
Magnesium = 2,8,2
◉Define these terms: -
• Element
• Compound
• Mixture . Answer: Element - a pure substance made from 1 type of
atom only
Compound - 2 or more elements chemically bound
Mixture - 2 or more elements or compounds mixed together which are
not chemically bound
