Ionic Compound

Question 1

Valence Electrons & Stability

Answer 1

• Full Valence energy level= stable
• Atoms can gain a full valance set by losing or gaining electrons
• This makes atom an ion

Question 2

Ions & The Periodic Table

Answer 2

• Metals are positive ions (cation)
• Non metals are negative ions (anion)
• Positive ions/metals don’t change their name (-ide)

Question 3

Lewis Diagrams for Ions

Answer 3

• Shows element, charge and valence electrons
• Ionic bond= attraction of positive and negative
• Positive and negative beside each other

Question 4

Structure of Ionic Compounds

Answer 4

• Crystal Lattice= Repeating formulas in ionic compound
• 1 unit of ionic compound is a formula unit

Question 5

State at room temperature

Answer 5

Solid
Electrostatic forces are strong keeping ion solid

Question 6

Melting/Boiling point

Answer 6

• High melting point
• Held by electrostatic forces, allowing high melting point
• Electrostatic force= bond between positive and negative (formula unit)

Question 7

Physical properties

Answer 7

• Hard
• Strong force of attraction keeps it in solid form= making it hard
• Brittle
• If you apply external force, it causes shift in layers so hard that same charges align
• When like charges on on top of eachother, it’s going to cause repulsion and breakage

Question 8

Solubility in water

Answer 8

• If crystal is placed in water, water will surround each ion and will start to speater
• O atoms are slightly negative so they join with sodium
• H atoms are slightly positive so they join with chlorine
• Opposite forces attract
• Water molecules pulls elements away from solid
• It will slowly break away and become aquous (mixed with water)

Question 9

Electrical conductivity as a solid

Answer 9

None
Need to dissolve in water and move freely to conduct electricity

Question 10

Electrical conductivity when dissolved in water

Answer 10

• When dissolved, ionic compounds can conduct electricity
• This creates electrolyte
• Dissolved ion scan move more freely, and carry charges in the water