(a(i))[1]
State the symbol of the element used to supply an inert atmosphere in lamps.
(a(ii))[1]
State the symbol of the element whose oxide is used to neutralise acidic industrial waste.
(a(iii))[1]
State the symbol of the element whose atom forms a stable ion by losing one electron.
(a(iv))[1]
State the symbol of the metal element used as an inert electrode.
(a(v))[1]
State the symbol of the element whose ion gives a green precipitate when aqueous sodium hydroxide is added.
(b(i))[1]
State the meaning of the term element.
(b(ii))[2]
Deduce the numbers of protons and neutrons in this isotope.
(c)[1]
Complete the electronic structure of a chlorine atom.