Topic 3 Flashcards
Elements that make an ionic bond
Metal and non metal
Ionic bonding
Strong electrostatic force of attraction between oppistitly charged ions
High mp / bp
Conducts when molten or dissolved
Soluable in water
Eg soduim chloride
strength of ionic bonds
Strong
Why do atoms gain or lose electrons
To have a full outer shell
What happens to metal atoms while forming ions
Metal gains electrons while non-metal loses electrons
Metallic bonding
Only metals
the electrons leave the outer shells of metal atoms, forming positive metal ions and a ‘sea’ of delocalised electrons
Very strong
Covalent bonds/molecular
Non metals
two non-metal atoms share a pair of electrons
Eg water, oxygen
Strong bonds but weak forces of attraction
Does not conduct exception of water
Low mp / bp
Don’t conduct cause no chreges particles
Molecule
A group of atoms bonded together
Diatomic molecule
Composed of only two atoms
Discrete molecular substance
Covalent molecule where the inner forces are week
Examples of covalent network
High mp/bp
Diamond
Strong bonds
Insoluble in water
Don’t conduct exception of graphite
Why do metals and carbon conduct electricity
When electrons are free to move
Why do covalent compound not conduct electricity
No free electrons and no ions
In what state can ionic compounds conduct
Dissolved in water
Molten
So electron are free to move
Why do metals have a high mp/bp
Cause its electrons are free to move
