Bonding and Structure - Ionic and Metallic Bonding Flashcards
What type of substances usually join together to form ionic compounds?
Metal and non-metal
Describe ionic bonding
It is an electrostatic force of attraction between oppositely charged ions
What can be said about the strength of ionic bonds
They are strong
Why do atoms gain or lose electrons
They are more stable with a full outer shell of electrons.
This is known as the Octet Rule of Thumb - when forming compounds atoms tend to have a stable electron arrangement like a noble gas with 8 electrons in the outer shell.
What always happen when metal atoms form ions?
They lose electrons to from positive ions
How do you work out how many electrons a metal loses when it forms an ion?
A metal loses electrons equal to the number of electrons in the outer shell.
They are more stable with a full outer shell of electrons
What happens to non-metal atoms when they form ions?
They always gain electrons to become negative ions.
How do you work out how many electrons a non-metal atoms gains when it forms an ion?
The number of electrons gained is the same as the number of electrons needed to fill the outer shell
Why type of substances have metallic bonding?
Metals
Describe metallic bonding
Electrostatic attraction between positively charged atom cores or ions and delocalised electrons.
What can be said about the strength of the metallic bond?
It is strong
