Atoms, elements and compounds — IGCSE Chemistry (0971) questions by topic
Atoms, elements and compounds questions test fundamental classification: judging statements about silicon(IV) oxide's conductivity and structure, picking out the option that combines exactly one element together with one compound rather than two elements or two compounds, working out which atom has equal numbers of protons, neutrons and electrons such as sodium-23, and completing a table of relative charge and mass for electrons, neutrons and protons. Identify, complete, calculate, state and give want precise, short factual answers about particle structure.
8 questions from 2025 papers sit on this page, worth between 1 and 10 marks. Because classification questions here depend on precisely distinguishing elements, compounds and mixtures, submitting an answer for instant marking flags quickly whether a substance, such as air or a dissolved gas, has been correctly sorted rather than confused with a similar-looking category.
May–June 2025, Paper 12
Which substance is a mixture of one element and one compound? A aqueous glucose B clean, dry air C oxygen dissolved in distilled water D stainless steel
Answer this question and get it marked →What is different for isotopes of the same element? A nucleon number B number of electron shells C number of electrons in the outer electron shell D proton number
Answer this question and get it marked →May–June 2025, Paper 21
Which atom has an equal number of protons, neutrons and electrons? A 40-Ar (argon-40) B 1-H (hydrogen-1) C 23-Na (sodium-23) D 14-N (nitrogen-14)
Answer this question and get it marked →The only naturally occurring isotopes in a sample of europium are 151-Eu and 153-Eu. This sample of europium has a relative atomic mass, Ar, of 152. What is the percentage of…
Answer this question and get it marked →May–June 2025, Paper 22
Which row gives the number of protons, electrons and neutrons in an atom of zinc? protons electrons neutrons --- --- --- --- A 30 30 35 B 30 35 35 C 35 30 30 D 35 35 30
Answer this question and get it marked →Which particles have the electronic configuration 2,8,8? 1 an argon atom, Ar 2 an aluminium ion, Al^3+ 3 a sodium ion, Na^+ 4 a chloride ion, Cl^- A 1 and 3 B 1 and 4 C 2 and 3 D…
Answer this question and get it marked →Which statement about silicon(IV) oxide, SiO2, is correct? A It conducts electricity because it contains delocalised electrons. B It has a giant covalent structure with each…
Answer this question and get it marked →May–June 2025, Paper 41
Atoms are made of electrons, neutrons and protons. Complete Table 2.1 to show the relative charge and relative mass of each particle. Table 2.1 particle relative charge relative…
Answer this question and get it marked →