Chemistry 0620 · IGCSE
Isotopes
100 practice questions on Isotopes, with worked solutions and instant marking.
X and Y are isotopes of one element. Which statement is correct?
Feb/March 2016
Which statement accounts for why isotopes of an element show the same chemical properties?
Feb/March 2017
The diagrams show the structures of five substances, A, B, C, D and E. A contains an ionic lattice with Na⁺ and Br⁻ ions arranged in alternating positions. B is a molecule in which two carbon atoms are bonded to each other, and each carbon is also bonded to hydrogen and bromine atoms. C represents O=C=O. D has a central iodine atom joined to three chlorine atoms. E represents O=O. Use only the substances shown in the diagram to answer the questions below. A substance may be chosen once, more than once or not chosen at all.
Feb/March 2018
Which line identifies isotopes belonging to the same element?
Feb/March 2019
Which row gives isotopes of one element?
Feb/March 2019
This question concerns uranium and compounds of uranium.
Feb/March 2019
$^{14}_{6}\text{C}$ and $^{12}_{6}\text{C}$ are isotopes of carbon. Which statement correctly describes these isotopes?
Feb/March 2020
A neutral atom, J, has 45 neutrons and 35 electrons. Which row shows the correct information for atom J?
Feb/March 2021
Which is the correct definition of isotopes?
Feb/March 2021
Which statement correctly describes the atoms of every carbon isotope?
Feb/March 2021
The table sets out the numbers of protons, neutrons and electrons for particles A to I.
Feb/March 2021
Bromine has two stable isotopes. Isotope 1 has mass number $79$ and isotope 2 has mass number $81$. Which of the following statements is correct?
Feb/March 2023
Which of the following statements about isotopes is correct?
Feb/March 2024
The relative atomic mass, $A_r$, of an element is the mean mass of the isotopes of that element when compared with another particle. What particle is used for this comparison?
Feb/March 2024
The calcium isotopes shown are $^{40}_{20}\text{Ca}$ and $^{44}_{20}\text{Ca}$. Which statement accounts for the fact that these calcium isotopes have the same chemical properties?
Feb/March 2024
The following data refer to four metal atoms or ions. Q: charge $+3$, electrons $10$, nucleon number $27$. R: charge $+2$, proton number $12$, nucleon number $24$. S: charge $+2$, electrons $10$, nucleon number $26$. T: proton number $16$, electrons $16$. Which two atoms or ions are isotopes of the same element?
Feb/March 2025
Element T contains two isotopes, $^{12}_{6}\text{T}$ and $^{14}_{6}\text{T}$. Which of the following statements about these isotopes is correct?
Feb/March 2025
The diagram illustrates several properties that substances can possess. Which labelled section of the diagram includes $^{235}\text{U}$?
May/June 2016
An aluminium atom has a nucleon number of $27$ and a proton number of $13$. How many neutrons are present in this aluminium atom?
May/June 2016
The diagram illustrates some properties that substances can possess. Which labelled section of the diagram includes $^{235}\text{U}$?
May/June 2016
The diagram illustrates a number of properties that substances may possess. Which labelled section of the diagram includes $^{235}_{92}\text{U}$?
May/June 2016
The diagram illustrates some properties that substances can possess. In which labelled section of the diagram does $^{235}\text{U}$ belong?
May/June 2016
Which statements concerning isotopes of the same element are correct?
May/June 2016
The diagram illustrates a number of properties that substances can possess. To which labelled section of the diagram does $^{235}\text{U}$ belong?
May/June 2016
Which of the following statements about isotopes of the same element are correct?
May/June 2016
The diagram indicates several properties that substances can possess. $^{{235}}_{{92}}\text{U}$ belongs in which labelled section of the diagram?
May/June 2016
Which of the following statements about isotopes of the same element are correct?
May/June 2016
Protons, neutrons and electrons are types of subatomic particles.
May/June 2016
Which is the correct definition of isotopes?
May/June 2017
The six atoms below are shown in nuclear notation. $^{3}_{1}A\quad ^{3}_{2}D\quad ^{12}_{6}E\quad ^{13}_{6}G\quad ^{14}_{7}J\quad ^{19}_{9}L$
May/June 2017
In which atom does the number of protons match the number of neutrons?
May/June 2018
Chlorine has two common isotopes, $^{35}\text{Cl}$ and $^{37}\text{Cl}$. The information for these two isotopes is shown. Which statement gives the reason that both isotopes are the same element?
May/June 2018
Which pair contains particles with identical chemical properties?
May/June 2018
Iron has atomic number 26. It exists as the isotopes $^{54}\text{Fe}$, $^{56}\text{Fe}$, $^{57}\text{Fe}$ and $^{58}\text{Fe}$. Which statement gives the reason that these isotopes have the same chemical properties?
May/June 2018
This question concerns isotopes.
May/June 2018
This question concerns isotopes.
May/June 2018
This question concerns isotopes.
May/June 2018
What is meant by an isotope of $^{31}_{15}E$?
May/June 2019
The arrangement of an atom is displayed. An isotope of which element is the atom?
May/June 2019
What does the term isotope mean for $^{31}_{15}\text{E}$?
May/June 2019
The diagram shows the structure of an atom. Of which element is this atom an isotope?
May/June 2019
$^{22}_{11}\text{Na}$, $^{23}_{11}\text{Na}$ and $^{24}_{11}\text{Na}$ are isotopes of the element sodium.
May/June 2019
Magnesium occurs as three isotopes, $^{24}_{12}\text{Mg}$, $^{25}_{12}\text{Mg}$ and $^{26}_{12}\text{Mg}$.
May/June 2019
Some details about particles P, Q, R and S are shown. The table lists the nucleon number, the number of neutrons and the number of electrons for each particle. Which two particles are isotopes of the same element?
May/June 2021
Which statement is correct about isotopes of one element?
May/June 2021
The information below about particles P, Q, R and S is shown. Which two particles are isotopes of one and the same element?
May/June 2021
Which statement about isotopes of the same element is correct?
May/June 2021
Silver’s atomic number is 47.
May/June 2021
Details of the structures of three atoms, X, Y and Z, are given below. X: proton number $1$, nucleon number $1$ Y: proton number $1$, nucleon number $2$ Z: proton number $1$, nucleon number $3$ Which statements about atoms X, Y and Z are true?
May/June 2022
X and Y are two distinct elements. X and Y contain the same number of nucleons. Which statement about X and Y is correct?
May/June 2022
The numbers of protons and neutrons in the atoms of elements X, Y and Z are shown. Which statement about these elements is correct?
May/June 2022
An atom consists of protons, neutrons and electrons. Atoms belonging to the same element are called isotopes.
May/June 2022
Describe how these sulfur isotopes are alike and how they are different.
May/June 2022
The atomic structures of four particles, W, X, Y and Z, are shown below. Which of these particles are isotopes of the same element?
May/June 2023
The symbols for two different isotopes of element $\text{S}$ are given as $^m_n\text{S}$ and $^p_q\text{S}$. The letters m, n, p and q stand for whole numbers. Which of the following statements about m, n, p and q are correct? 1. $m = p$ 2. $n = q$ 3. $m > q$
May/June 2023
The atomic structures of four particles, W, X, Y and Z, are displayed. Which of these particles are isotopes of the same element?
May/June 2023
Which statement explains why isotopes of a given element show the same chemical properties?
May/June 2023
Two atoms, X and Y, share the same mass number but have different atomic numbers. Which statement about X and Y is correct?
May/June 2023
A pure iron sample contains only three isotopes. This sample of iron has a relative atomic mass of 55.9. What is the value of $n$?
May/June 2023
Define what isotopes are.
May/June 2023
occurs in purified bauxite
May/June 2023
Which row gives the counts of protons, neutrons and electrons in the ion $^{{18}}_{{8}}\text{O}^{2-}$?
May/June 2024
Isotopes of a single element have some characteristics that are alike and some that are unlike. Which row shows the characteristics that are alike and the ones that are unlike?
May/June 2024
Which statement accounts for why isotopes of the same element display the same chemical properties?
May/June 2024
Which of the following statements about isotopes are correct?
May/June 2024
Sulfur belongs to Group VI.
May/June 2024
Which row shows the numbers of electrons, neutrons and protons in a particle that is an isotope of $^{11}_{5}\text{B}$?
May/June 2025
What distinguishes isotopes of the same element?
May/June 2025
In this europium sample, the only isotopes that occur naturally are $^{151}\text{Eu}$ and $^{153}\text{Eu}$. The relative atomic mass, $A_r$, of the sample is $152$. Determine the percentage of $^{151}\text{Eu}$ in the sample, giving your answer to three significant figures.
May/June 2025
A sample of element $Q$ contains two isotopes. Their relative masses and abundances are displayed. What is the relative atomic mass of this sample of $Q$ correct to three significant figures?
May/June 2025
Which atom contains double the number of neutrons compared with protons?
May/June 2025
Atoms are composed of electrons, neutrons and protons.
May/June 2025
This question concerns atoms, ions and isotopes.
Oct/Nov 2016
Fill in the table.
Oct/Nov 2016
In which pair of atoms is the number of neutrons the same?
Oct/Nov 2017
Which statement accounts for why isotopes of the same element have identical chemical properties?
Oct/Nov 2017
Why do isotopes of a single element exhibit the same chemical properties?
Oct/Nov 2017
Carbon exists naturally in three isotopes, $^{12}\text{C}$, $^{13}\text{C}$ and $^{14}\text{C}$. Which statement explains why these isotopes have identical chemical properties?
Oct/Nov 2017
What does the term molecule mean?
Oct/Nov 2017
What number of neutrons does the atom $^{45}_{21}X$ contain?
Oct/Nov 2018
Which statement gives the definition of isotopes?
Oct/Nov 2018
Which of the following statements about the isotopes of an element is correct?
Oct/Nov 2018
How many neutrons does the atom $^{45}_{21}X$ contain?
Oct/Nov 2018
The naturally occurring oxygen isotopes are $^{16}\text{O}$ and $^{17}\text{O}$. Which of the following statements is correct?
Oct/Nov 2018
Which statement gives a description of isotopes?
Oct/Nov 2018
X and Y are both atoms. X and Y show identical chemical properties. Which row gives the atomic structures of X and Y?
Oct/Nov 2018
The table contains information on four separate particles, A, B, C and D.
Oct/Nov 2018
An isotope of chromium is written as $^{52}_{24}\text{Cr}$. Which of the following statements about an atom of this chromium isotope is correct?
Oct/Nov 2019
The numbers of protons, neutrons and electrons in atoms P, Q, R and S are given. Which of these atoms are isotopes of the same element?
Oct/Nov 2019
An isotope of chromium is written as $^{52}_{24}\text{Cr}$. Which of the following statements about one atom of this chromium isotope is correct?
Oct/Nov 2019
Element X contains two isotopes, $^{12}_{6}X$ and $^{14}_{6}X$. Which statement about these isotopes is correct?
Oct/Nov 2019
Rubidium has two isotopes, $^{85}_{37}\text{Rb}$ and $^{87}_{37}\text{Rb}$. Which statement accounts for why both isotopes show the same chemical properties?
Oct/Nov 2019
The numbers of protons, neutrons and electrons in atoms P, Q, R and S are shown. Which of these atoms are isotopes of the same element?
Oct/Nov 2019
Carbon exists in three isotopes, $^{12}\text{C}$, $^{13}\text{C}$ and $^{14}\text{C}$. Why do these three isotopes all show the same chemical properties?
Oct/Nov 2019
This calcium isotope is shown in the notation $^{44}_{20}\text{Ca}$.
Oct/Nov 2019
This question concerns sulfur and compounds containing sulfur. The isotope of sulfur is shown here: $^{33}_{16}\text{S}$.
Oct/Nov 2019
What does the term isotopes mean?
Oct/Nov 2019
Which of the following statements about isotopes is correct?
Oct/Nov 2020
The isotopes $^{12}\text{C}$ and $^{14}\text{C}$ are both forms of carbon. Which statement about these isotopes is correct?
Oct/Nov 2021
In one atom of the isotope $^{{27}}_{{13}}\text{Al}$, how many protons, neutrons and electrons are present?
Oct/Nov 2021