Chemistry 0620: THE PERIODIC TABLE Topical Past Paper Questions

This question is about elements. **(a)** Identify an element that: > **(i)** is approximately 21% of clean, dry air [1] > > **(ii)** is in Group 1 and Period 4 of the Periodic Table [1] > > **(iii)** contains atoms with exactly 24 protons [1] > > **(iv)** removes tastes and odour…

This question is about metallic compounds. (a) Insoluble metal salts, such as lead(II) sulfate, are made by precipitation. When aqueous lead(II) ions react with aqueous sulfate ions, a precipitate of lead(II) sulfate forms. A sample of pure lead(II) sulfate can be obtained from t…

The elements in Group VII of the Periodic Table are known as the halogens. Halogens can form halide ions. (a) Identify the halogen with the lowest density at r.t.p. (room temperature and pressure). [1] (b) State the appearance of bromine at r.t.p. [1] (c) Use the Periodic Table t…