Atoms, elements and compounds — IGCSE Sciences - Co-Ordinated (0973) questions by topic
Atoms, elements and compounds questions complete a sodium atom's proton and electron structure, fill gaps describing what compounds are and how they form, describe atomic structure, and calculate a phosphorus atom's neutron count from its nucleon and proton numbers, worth from 1 to 11 marks.
State, identify and complete lead the command words in this IGCSE Co-ordinated Sciences topic, with explain and calculate also common: calculate neutrons by subtracting proton number from nucleon number, shown as working, not a guess. 29 real questions from 2023 to 2025 papers are collected below. Submit each attempt for instant marking to check subatomic-particle counts are correct before a whole table of structures is attempted.
May–June 2025, Paper 11
An atom of phosphorus has a nucleon number of 31 and a proton number of 15. How many neutrons are there in this atom? A 15 B 16 C 31 D 46
Answer this question and get it marked →May–June 2025, Paper 12
Which row describes particles present in 25/12 Mg^2+ (mass number 25, proton number 12)? neutrons electrons --- --- --- A 12 10 B 12 12 C 13 12 D 13 10
Answer this question and get it marked →The formula of ethanol is C2H5OH. How many different elements are present in ethanol? A 1 B 3 C 4 D 9
Answer this question and get it marked →May–June 2025, Paper 21
The electronic configurations of four particles are shown. Each is drawn as a nucleus surrounded by shells of crosses representing electrons. The four diagrams (1-4) show…
Answer this question and get it marked →An aluminium atom forms an aluminium ion, Al3+. Which statement describes what happens to the aluminium atom? A It gains 3 electrons. B It gains 3 protons. C It loses 3 electrons.…
Answer this question and get it marked →Compounds are made up from two or more different elements ......1...... bonded together. Compounds cannot be broken down into simpler substances by ......2...... processes.…
Answer this question and get it marked →May–June 2025, Paper 41
A sodium atom is represented with numbers next to its chemical symbol, as shown in Fig. 6.1: mass number 23 (top left) and atomic number 11 (bottom left) next to the symbol Na.…
Answer this question and get it marked →May–June 2025, Paper 42
The element carbon has a proton (atomic) number of 6. Complete Fig. 5.1 to show the electronic configuration of a carbon atom. Fig. 5.1 shows a central nucleus labelled C…
Answer this question and get it marked →May–June 2024, Paper 12
Which statement about atoms is correct? A All atoms contain equal numbers of neutrons and protons. B All atoms of the same element have the same number of neutrons. C The Periodic…
Answer this question and get it marked →An atom of an isotope of strontium (Sr) has a proton number of 38 and contains 52 neutrons. What is the nuclide notation for this isotope? A 52/38 Sr B 90/38 Sr C 38/52 Sr D 90/52…
Answer this question and get it marked →May–June 2024, Paper 21
A proton has charge q and mass m. A neutron has no charge and mass m. Which row shows the charge and mass of an alpha-particle (2 protons and 2 neutrons)? A charge 2q, mass 2m B…
Answer this question and get it marked →May–June 2024, Paper 31
A calcium atom has a proton number of 20 and a nucleon number of 40. Deduce the number of protons, neutrons and electrons in this atom of calcium.
Answer this question and get it marked →May–June 2024, Paper 41
Fig. 5.1 shows part of the structure of lithium chloride (alternating Li+ and Cl- ions in a lattice). Deduce the formula of lithium chloride.
Answer this question and get it marked →October–November 2024, Paper 41
May–June 2023, Paper 11
The element phosphorus burns in air, as shown. 4P + 5O2 - P4O10 What does the formula P4O10 show? A a mixture of atoms of two elements B a mixture of molecules of two elements C a…
Answer this question and get it marked →Which row describes an atom that has the nucleon number 24? A protons 8, neutrons 8, electrons 8 B protons 12, neutrons 12, electrons 12 C protons 21, neutrons 24, electrons 21 D…
Answer this question and get it marked →May–June 2023, Paper 12
An atom of osmium is represented by 190/76 Os (nucleon number 190, proton number 76). How many neutrons are in this atom? A 76 B 114 C 190 D 266
Answer this question and get it marked →May–June 2023, Paper 21
The element phosphorus burns in air, as shown. 4P + 5O2 - P4O10 What does the formula P4O10 show? A a mixture of atoms of two elements B a mixture of molecules of two elements C a…
Answer this question and get it marked →Which row describes an atom that has the nucleon number 24? A protons 8, neutrons 8, electrons 8 B protons 12, neutrons 12, electrons 12 C protons 21, neutrons 24, electrons 21 D…
Answer this question and get it marked →May–June 2023, Paper 22
An atom of osmium is represented by 190/76 Os (nucleon number 190, proton number 76). How many neutrons are in this atom? A 76 B 114 C 190 D 266
Answer this question and get it marked →May–June 2023, Paper 32
An atom of calcium has 20 protons and 20 neutrons. State the number of electrons in this calcium atom.
Answer this question and get it marked →May–June 2023, Paper 41
Fig. 5.1 shows a diagram of a lithium atom (nucleus containing two labelled particle types, and a third particle type outside the nucleus). Complete the labels on Fig. 5.1.
Answer this question and get it marked →May–June 2023, Paper 42
Copper has two isotopes, copper-63 and copper-65. Table 8.1 shows information about copper-63 and copper-65 (proton/atomic number, nucleon/mass number, protons, neutrons,…
Answer this question and get it marked →October–November 2023, Paper 11
What do the chemical symbols N2 and Ni represent? A N2 a compound, Ni a compound B N2 a compound, Ni an element C N2 an element, Ni a compound D N2 an element, Ni an element
Answer this question and get it marked →The nucleon number of a hydrogen atom is 1. What is present inside the nucleus of this atom? A one proton and one electron B one proton and one neutron C one proton only D one…
Answer this question and get it marked →The diagram represents an ionic compound formed from three types of atom (key: oxygen, sodium and sulfur). [Diagram: ionic compound with sodium, sulfur and oxygen atoms in the…
Answer this question and get it marked →A nuclide of hydrogen is represented by 3/1 H (nucleon number 3, proton number 1). Which row shows the number of protons and the number of neutrons in this nuclide? A protons 1,…
Answer this question and get it marked →October–November 2023, Paper 21
What do the chemical symbols N2 and Ni represent? A N2 a compound, Ni a compound B N2 a compound, Ni an element C N2 an element, Ni a compound D N2 an element, Ni an element
Answer this question and get it marked →The nucleon number of a hydrogen atom is 1. What is present inside the nucleus of this atom? A one proton and one electron B one proton and one neutron C one proton only D one…
Answer this question and get it marked →Other IGCSE Sciences - Co-Ordinated topics
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