Chlorine is an element of atomic number 17. It is a mixture of two isotopes having mass number of 35 and 37. (i) What is meant by 'atomic number of an element' ? What do you understand by an 'atom'. (ii) Write down the electronic configuration of the chlorine atom. (iii) State the number of protons, electrons and neutrons in the following isotopes: , (iv) Explain why the two atoms in (iii) above have the same chemical reactions. (v) If molten magnesium chloride is electrolysed suggest a suitable electrode [anode].