Everything Science Grade 10

6.5 CHAPTER 6. CHEMICAL BONDING

Exercise 6 - 3

1. Explain the difference between acovalentand anionicbond.

2. Magnesium and chlorine react to form magnesium chloride.

a. What is the difference in electronegativity between these two ele-

ments?

b. Give the chemical formula for:

i. a magnesium ion

ii. a chloride ion

iii. the ionic compound that is produced during this reaction

c. Write a balanced chemical equation for the reaction that takes place.

3. Draw Lewis diagrams to represent the following ionic compounds:

a. sodium iodide (NaI)

b. calcium bromide (CaBr 2 )

c. potassium chloride (KCl)

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(1.) 0028 (2.) 0029 (3.) 002a

Metallic Bonding ESACA

The nature of the metallic bond ESACB

The structure of a metallic bond is quite different from covalent and ionic bonds. In a

metallic bond, the valence electrons aredelocalised, meaning that an atom’s electrons do

not stay around that one nucleus. In a metallic bond, the positive atomic nuclei (sometimes

called the “atomic kernels”) are surrounded by a sea of delocalised electrons which are

attracted to the nuclei (see figure below).

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116 Chemistry: Matter and Materials