a) Define the term 'electronegativity' and explain how it varies across Period 3 and down Group VII of the periodic table. (4 marks)

b) Using dot-and-cross diagrams, show the bonding in the following compounds:
i) Magnesium chloride (MgCl2)
ii) Ammonia (NH3)
(6 marks)

c) State THREE differences between ionic bonding and covalent bonding. (3 marks)

d) Explain why magnesium chloride has a high melting point while hydrogen chloride has a low melting point. (3 marks)

Question

a) Define the term 'electronegativity' and explain how it varies across Period 3 and down Group VII of the periodic table. (4 marks)

b) Using dot-and-cross diagrams, show the bonding in the following compounds:
   i) Magnesium chloride (MgCl2)
   ii) Ammonia (NH3)
   (6 marks)

c) State THREE differences between ionic bonding and covalent bonding. (3 marks)

d) Explain why magnesium chloride has a high melting point while hydrogen chloride has a low melting point. (3 marks)

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