Bonding And Structure Flashcards
When does an ionic bond occur?
Occurs between a metal and a non metal
What is a giant ionic lattice?
It’s a 3 dimensional structure of oppositely charged ions held together by strong ionic bonds
What is the charge on NO3?
NO3-
What is the charge on CO3?
Co3 2-
What is the charge on an ammonia ion?
NH4 +
What is a covalent bond?
It’s a bond formed by a shared pair of electrons
What’s a single covalent bond?
Where each atom has one electron in its outer shell
Each atom contributes one electron to the covalent bond
The covalent bond is often written as a line eg H-H
What are multiple covalent bonds?
Sharing two pairs of electrons forming a double bond eg O=O
Sharing three pairs is a triple bond
What is a dative covalent bond?
Is a shared pair of electrons which has been provided by one of the bonding atoms only
What is the shape of a molecule dependent on
The number of pairs of electrons in the outer shell
Electrons pairs push each other apart as far as possible
Describe the shape and state the bond angle of tetrahedral?
Tetrahedral has 4 bonding pairs
The angle is 109.5 degrees
Describe the shape and state the bond angle of pyramidal
3 bonding pairs and one line pair
107.5 degrees
Describe the shape and state the bond angle of bent
2 line pairs and 2 bonding pairs
104.5
Describe the shape and state the bond angle of trigonal planar
Three bonding pairs
120 degrees
Describe the shape and state the bond angle of octahedral
6 bonding pairs
90 degrees
