Choose from the following elements to answer the questions below. aluminium argon carbon copper iodine iron lead magnesium nitrogen oxygen sulfur Each of these elements can be used once, more than once or not at all. Which element

1. (a)has an ion which, in aqueous solution, reacts with aqueous sodium hydroxide to give a red-brown precipitate,[1]
2. (b)has an atom with an electronic configuration with only five occupied electron shells,[1]
3. (c)has an oxide which decolourises acidified potassium manganate(VII),[1]
4. (d)has a sulfate which is insoluble in water,[1]
5. (e)provides an inert atmosphere for the extraction of reactive metals,[1]
6. (f)produces ammonia when it is warmed with an aqueous mixture of sodium nitrate and sodium hydroxide?[1]