End of year revision topic 2 Flashcards
In ionic bonding, what are the particles?
Oppositely charged ions
In covalent bonding, what are the particles?
Atoms which share pairs of electrons
In metallic bonding, what are the particles?
Atoms which share delocalised electrons
Where does metallic bonding occur?
In metallic elements and alloys
What is chemical bonding?
An attraction between atoms which enables them to form a stable chemical compound
How to work out the charge on the ions of metals and non metals from the group number of the element
The number of charges on a metal is equal to the group number of the metal and the number of charges on a non metal is equal to the group number minus 8
What is empirical formula?
The simplest whole number ratio of atoms of each element in the compound
What do covalently bonded substances consist of?
Small molecules
What are the limitations of dot and cross diagrams?
Doesn’t show how the ions are arranged in space
What is the structure of an ionic compound?
Regular structure (giant ionic lattices) where there are strong electrostatic forces of attraction
Do ionic compounds conduct electricity while melted or dissolved in water?
Yes
How are atoms arranged in pure metals?
In layers allowing them to be bent and shaped
Why are alloys harder than pure metals?
Alloys contain atoms of different sizes making the layers harder to slide over each other so alloys are harder than pure metals
Structure and bonding of diamond?
Giant covalent structure in which each carbon atom is joined to four other carbon atoms by covalent bonds carbon atoms have regular lattice arrangement
In graphite, how many covalent bonds are formed from each carbon atom?
3
