(a) Write down the electron arrangement in (i) a magnesium atom, and (ii) a chlorine atom.(b) How many electrons are there in the valence shell of (i) a magnesium atom, and (ii) a chlorine atom.
(c) Show the formation of magnesium chloride from magnesium and chlorine by the transfer of electrons.
(d) State whether magnesium chloride will conduct electricity or not. Give reason for your answer.
(e) Why are covalent compounds generally poor conductors of electricity?
(a) The electron arrangement in:
(i) Magnesium: 2, 8, 2
(ii) Chlorine: 2, 8, 7
(b) No. of electrons present in the valence shell of
(i) Magnesium atom: 2
(ii) Chlorine atom: 7
(c) Formation of magnesium chloride is shown below:
Magnesium loses 2 electrons to fulfil its octet, whereas 2 chloride atoms gain one electron each to fulfil their octet.
(d) Magnesium chloride will conduct electricity because it is an ionic compound. Ionic compounds contain ions that are responsible for conducting electricity.
(e) Covalent compounds are generally poor conductors of electricity because they are held together by electrically neutral molecule and do not have ions.
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