This question is about sulfur and some of its compounds.
Atoms of sulfur can be represented as 32S^{32}\text{S}32S and 34S^{34}\text{S}34S.
State the number of protons, neutrons and electrons in an atom of 34S^{34}\text{S}34S.
What name is used for atoms of sulfur that have different numbers of neutrons?
Why do all atoms of sulfur have the same chemical properties?
The relative atomic mass of sulfur is given in the Periodic Table as 32.132.132.1. Suggest, with a reason, which of the atoms 32S^{32}\text{S}32S and 34S^{34}\text{S}34S exists in greater numbers in a sample of sulfur.
Hydrogen sulfide (H2S\text{H}_2\text{S}H2S) and sodium sulfide (Na2S\text{Na}_2\text{S}Na2S) are compounds of sulfur.
Describe the distribution of outer-shell electrons in a hydrogen sulfide molecule by stating the number of shared electron pairs in the bonds and the number of unshared outer-shell electrons remaining on the sulfur atom.
Explain how the atoms are held together in a hydrogen sulfide molecule.
Explain why sodium sulfide has a higher melting point than hydrogen sulfide.
A compound has the percentage composition 36.5%36.5\%36.5% sodium, 25.4%25.4\%25.4% sulfur and 38.1%38.1\%38.1% oxygen by mass. Calculate its empirical formula. [Relative atomic masses: Na=23\text{Na} = 23Na=23, S=32\text{S} = 32S=32, O=16\text{O} = 16O=16]
41 exam-style questions on Edexcel IGCSE Chemistry Atomic structure. Each one has a worked solution and a mark scheme showing where the marks go.