C3 Ionic bonding, metallic bonding and structure Flashcards
What is an ion?
atom that has either lost or gained electrons
What type of elements form ionic bonds?
metals and non-metals
What charge ion does group two form?
2+
What charge ion does group six form?
2-
What force holds oppositely charged ions together?
electrostatic force of attraction
Describe the structure of a giant ionic lattice.
alternating positive and negative ions held together by electrostatic force of attraction
Why do ionic substances have a high melting point?
lots of energy needed to break the electrostatic force of attraction
Can ionic substances conduct electricity when solid?
No
Why don’t ionic substances conduct electricity when solid?
ions are in a fixed position and there are no delocalised electrons
Under what circumstances can ionic compound conduct electricity?
when molten or dissolved
Describe metallic bonding
electrostatic attraction between positive metal ions and delocalised electrons
Properties of pure metals
malleable
Why are pure metals malleable?
Because each layer of the metal can slide over each other
Why are metals good conductors?
Due to the delocalised electrons being able to move throughout the whole structure
Why do metals have a high melting and boilong point?
electrostatic force of attraction between the metal ions is strong
so lots of energy is needed to break them