Two isotopes of sulfur are ³²₁₆S and ³³₁₆S.

1. (a)What is meant by the term isotopes?[1]
2. (b)Complete the table for ³³₁₆S. number of neutrons number of protons electronic configuration[3]
3. (c)Sulfur forms simple molecules which have a relative molecular mass of 256. Suggest the formula of a sulfur molecule.[1]
4. (d)(i)Sulfur has a low melting point and does not conduct electricity. Explain why sulfur has a low melting point.[1]
5. (d)(ii)Explain why sulfur does not conduct electricity.[1]
6. (e)Sulfur reacts with potassium to form potassium sulfide. Write the formula and the electronic configuration of the positive ion and of the negative ion in potassium sulfide. positive ion formula ..................................................... electronic configuration .................................................. negative ion formula ..................................................... electronic configuration ..................................................[2]
7. (f)Sulfur reacts with hydrogen to form hydrogen sulfide, H2S. Draw the 'dot-and-cross' diagram to show the bonding in a molecule of hydrogen sulfide. Only draw the outer shell electrons.[2]
8. (g)Hydrogen sulfide reacts with sulfur dioxide to form sulfur and water. Write the equation for this reaction.[1]

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