Bonding Flashcards
(24 cards)
What is meant by an atom
Smallest particle of an element
What is meant by a molecule
two or more atoms held together by covalent bonds
What is a compound?
Two or more elements chemically combined
Covalent bonding exists between…
Non metals
What is covalent bond an attraction off
Covalent bond is an electrostatic attraction between both neclei in the bond and the a shared pairof electrons
Why do non-metals join covalent bonds
non-metal atoms join covalently in order to achieve a full outer shell of electrons
What is a lone pair of electrons
An unshared pair of electrons (or electrons that are not involved in bonding)
What is a covalent molecule
When 2 non-metals share unpaired electrons
What is an ion
A charged atom
What is a covalent network?
A structure where atoms are covalently bonded
How does the process of electron transfer leads to an ionic bond
The oppositely charged ions are strongly attracted to each other, forming ionic bonds .
What’s the charge on metals when they become ions
positively charged, metal atoms loose negative charges to form positively charged
What happens to non-metals when they become ions
They become negatively charged
Describe the structure of ionic compounds
An ionic compound is a giant structure of ions. The ions have a regular, repeating arrangement called an ionic lattice
When does metallic bonding occur
Among metal atoms
In metallic bonding what are free to move about
The outer electrons and this leaves positive metal ions
The moving outer electrons are often described as a sea of delocalised electrons
Why do metals conduct
due to the metallic bonding found within metal elements
Describe the properties of covalent bonds
Covalent bonds never conduct electricity and have lower melting points
Describe the properties covalent molecules
low boiling and melting points and do not conduct energy
Describe the products of covalent networks
High boiling points
Identify a linear molecule
A linear molecule has 2 bonds and 0 lone pairs
Identify an angular molecule
If there are two bond pairs and two lone pairs of electrons
O
/ \
H H
What’s an ionic bond between
A positively charged metal ion and a negatively charged non-metal ion
What’s a covalent bond between
Non-metals
