Chemistry 5070 · O Level
Atomic structure and the Periodic Table
59 practice questions on Atomic structure and the Periodic Table, with worked solutions and instant marking.
A particle has 34 protons, 45 neutrons and 36 electrons. Which symbol correctly represents this particle?
May/June 2015
To which element does sodium belong?
May/June 2015
Cr, Co, Fe and Mn are all transition elements. Which particles contain the same number of electrons?
May/June 2015
Which statement concerning the elements in the Periodic Table is correct?
May/June 2016
The symbols of two ions are displayed, $^{19}_{9}\text{F}^-$ and $^{21}_{11}\text{Na}^+$. Which statement is correct?
May/June 2016
A single atom of an element contains only eight electrons. Which statement about this element is correct?
May/June 2016
The table gives the proton numbers for four elements. Which option is correct?
May/June 2017
Which statement concerning the particles $^{19}_{9}\text{F}^-$, $^{20}_{10}\text{Ne}$ and $^{23}_{11}\text{Na}^+$ is correct?
May/June 2017
The table lists the proton numbers for four elements, Q, R, T and Z: Q = 9, R = 11, T = 17, Z = 19. Which statement is the correct one?
May/June 2017
Aluminium is a Group III element. It is obtained from its ore by electrolysis. From aluminium’s position in the Periodic Table, its aqueous ion is expected to be ...1.... . The way it is extracted shows that aluminium is ...2.... in the reactivity series. Which words complete gaps 1 and 2?
May/June 2018
The ion $Q^{2+}$ contains three full electron shells. Which element is $Q$?
May/June 2018
Cerium, Ce, has atomic number 58. One $\text{Ce}^{4+}$ ion contains 140 nucleons in its nucleus. How many protons, neutrons, and electrons are present in one $\text{Ce}^{4+}$ ion?
May/June 2018
Palladium is an element with atomic number 46. From where it is placed in the Periodic Table, some of its properties, together with the properties of its compounds, can be predicted. Which row is correct?
May/June 2019
Three separate elements react by giving up electrons. The ions produced each have the electronic configuration $2,8$. Which statement about these elements is correct?
May/June 2019
Cobalt is a transition element. A cobalt particle has 24 electrons and a nucleon number of 60. Which statement about this particle is correct?
May/June 2019
Three different elements undergo reaction by losing electrons. The ions produced each have the electronic configuration $2,8$. Which statement about these elements is correct?
May/June 2019
The particles $\text{K}^+$ and Ar may be written as $^{39}_{19}\text{K}^+$ and $^{40}_{18}\text{Ar}$. Which of the following statements about these particles is correct?
May/June 2019
Select answers from the particles listed below. The particles listed are: $^{79}_{35}\text{Br}$, $^{35}_{17}\text{Cl}$, $^{37}_{17}\text{Cl}$, $^{23}_{11}\text{Na}$, $^{17}_{8}\text{O}$, $^{39}_{20}\text{Ca}$, $^{37}_{17}\text{Cl}^-$, $^{64}_{29}\text{Cu}$, $^{20}_{10}\text{Ne}$, $^{18}_{8}\text{O}^{2-}$. A particle may be used once, more than once, or not at all.
May/June 2019
Select from the particles listed to answer the questions. Particles available: CH$_4$, Cl$^-$, Fe$^{2+}$, H$^+$, H$_2$S, MnO$_4^-$, NH$_4^+$, P$^{3-}$. Any particle may be used once, more than once, or not at all.
May/June 2019
Which particle has the greatest number of electrons?
May/June 2021
Refer to the Periodic Table to answer this question. Which two particles contain the same number of electrons?
May/June 2021
The table gives information about particles W, X, Y and Z. Which statements are correct?
May/June 2021
The two particles are shown by the symbols $^{54}_{26}\text{Fe}^{2+}$ and $^{59}_{27}\text{Co}^{3+}$. Which statement concerning these particles is correct?
May/June 2022
Element $X$ may be shown by the symbol $^{14}_{6}X$. Which of the following statements about one atom of element $X$ are correct?
May/June 2022
X, Y and Z are chemical elements. X and Y are located in the same period of the Periodic Table. Y and Z are located in the same group of the Periodic Table. What could be the electronic configurations of X, Y and Z?
May/June 2023
In the Periodic Table, the elements are organised into groups and periods. Which row is correct?
May/June 2023
Element Z, nucleon number $31$, forms the ion $Z^{3-}$. In which part of the Periodic Table is Z located?
May/June 2023
An atom of element Q has a total of $17$ electrons, while an atom of element R has a total of $19$ electrons. Which of the following statements about elements Q and R is correct?
May/June 2024
The diagram displays part of the Periodic Table. Which element is a metal with exactly three electrons in its outer shell?
May/June 2024
Which pair of particles has: • a total charge of zero • a total mass that is nearly the same as $\frac{1}{12}$ of the mass of an atom of $^{12}\text{C}$?
May/June 2024
A diagram of an atom of element X is shown. Which element is X?
May/June 2025
Which of the following statements about elements in the Periodic Table is correct?
May/June 2025
Atoms of element Q form positive ions. One ion of Q contains $10$ electrons and $14$ neutrons. Which of the following statements is correct?
May/June 2025
Which particle has the largest number of electrons?
May/June 2025
Three separate elements react by losing electrons. The ions produced each have the electronic configuration $2,8$. Which statement about these elements is correct?
Oct/Nov 2015
Which of the following statements about the Periodic Table is correct?
Oct/Nov 2015
The data given below could apply either to the atom or to the ion of the same element. • electronic configuration $2,8,8$ • nucleon number $40$ • proton number $20$ Which element is shown by these data?
Oct/Nov 2015
Select from the list of elements below to respond to the questions that follow. aluminium argon carbon copper iodine iron lead magnesium nitrogen oxygen sulfur Each element may be used once, more than once, or not used at all.
Oct/Nov 2015
One atom of element Q contains 17 electrons in total, and one atom of element R contains 19 electrons in total. Which statement about elements Q and R is correct?
Oct/Nov 2017
Which particle has an equal number of neutrons and electrons?
Oct/Nov 2017
Use the elements listed below to answer the questions. calcium chlorine chromium copper krypton nitrogen oxygen sodium sulfur You may use any element once, more than once, or not use it at all.
Oct/Nov 2017
Use the elements listed below to answer the questions. aluminium carbon hydrogen iron magnesium nitrogen oxygen sodium vanadium Each element can be selected once, more than once, or left unused.
Oct/Nov 2017
Which particle has the largest number of electrons?
Oct/Nov 2018
Five atoms are represented by their electronic configurations, which are labelled A, B, C, D and E.
Oct/Nov 2018
The Periodic Table arranges elements into groups and periods.
Oct/Nov 2018
Five atoms are given together with their electronic configurations. They are identified as A, B, C, D and E.
Oct/Nov 2018
Which element has an atom whose electronic configuration is the same as that of an atom of a strontium ion?
Oct/Nov 2020
A diagram of an ion is shown. What can be inferred about the number of protons in this ion?
Oct/Nov 2020
Which element has atoms with the same electronic configuration as an atom of an ion of strontium?
Oct/Nov 2020
The table presents data for several particles. What are the values of W, X and Y?
Oct/Nov 2021
The diagram displays the outer-shell electrons of the atoms of two elements, Q and R. The sulfate of Q does not dissolve in water. Element R is a gas at room temperature and pressure. Which row might be correct?
Oct/Nov 2022
The table gives the number of electrons in a single atom of each element W, X, Y and Z. W: 9; X: 15; Y: 19; Z: 35. Which of these statements is correct?
Oct/Nov 2023
An ion has an electronic configuration of $2,8,8$. It carries a $2-$ charge and has a nucleon number of $36$. How many neutrons are in the nucleus of this ion?
Oct/Nov 2024
The diagram illustrates an atom of element Z. Which symbol for element Z is correct?
Oct/Nov 2024
Fig. 1.1 presents the electronic configurations of five atoms, D, E, F, G and H. Use these configurations to answer the questions. Any configuration may be chosen once, more than once or not at all. State which electronic configuration, D, E, F, G or H, represents:
Oct/Nov 2024
Fig. 1.1 presents the electronic configurations of five atoms, A, B, C, D and E. Any one of these configurations may be used once, more than once or not used at all.
Oct/Nov 2024
A section of the Periodic Table is displayed. W, X, Y and Z are not the actual symbols for the elements. Which statement is correct?
Oct/Nov 2025
Element X has an atomic number of 12. What is the formula of the chloride formed by X?
Oct/Nov 2025
Atom X has an atomic number of 19 and a nucleon number of 42, while atom Y has an atomic number of 20 and a nucleon number of 40. Which of the following statements is correct?
Oct/Nov 2025