1
Q
What is a stable electronic structure?
A
Atoms that have 8 electrons filling their outer shell.
2
Q
What type of ion is formed when atoms lose an electron?
A
Positive (loses negativity)
3
Q
What type of ion is formed when atoms gain an electron?
A
Negative (gains negativity)
4
Q
What type of atoms will lose electrons to become stable?
A
Metal
5
Q
What is ionic bonding between?
A
Metal and non-metal
6
Q
Describe the ionic bonding of magnesium oxide.
A
- Magnesium loses two electrons
- Oxygen gains two electrons
7
Q
What structures do sodium chloride and magnesium oxide form?
A
- Giant ionic lattice
- Positive ions have strong electrostatic attraction to negative ions
- Can conduct electricity when molten
- Sodium chloride solution can conduct electricity
8
Q
What are the physical properties of magnesium oxide and sodium chloride?
A
- Have high mp as there are strong electrostatic attractions between positive and negative ions
- Don’t conduct electricity when in solid form as there are no free ions
- Can conduct electricity in solution or when molten because the ions are free to move
9
Q
Why does MgO have a higher mp than NaCl?
A
- Magnesium gives 2 electrons rather than just one to the oxygen atom so the electrostatic attraction is stronger
- Magnesium are small in radius so they can get very close the oxygen making the bond stronger so more energy is needed to separate the ions
