Mix Of Chapter 4&5 Ionic And Covalent Compounds Flashcards
(12 cards)
What is the valency of an atom?
It is the number of electrons that must be gained, lost or shared in order to attain a noble gas/stable configuration
What are valence electrons?
The number of electrons in he last electron shell
Why do atoms combine?
To obtain a stable configuration (like noble gases in group 18)
What about noble gases?
- Have full valence electron shells
- are monoatomic atoms
What is a cation?
- positive ions that have a net positive charge and usually have a noble gas configuration
What is an anion?
- negative ions that have a net negative charge and usually have a noble gas configuration
What is an allotrope?
They are different forms of the same element but with different structural arrangement of atoms
E.g. graphite, coal and diamond are all made of carbon
What are the types of bonding and how to differentiate them?
Ionic bonding —between metals and non metals. Gain/loses electrons
Covalent bonding — between non metals. Share electrons
Structure of ionic compound?
The ionic compound is in a giant ionic lattice structure, which is a three dimensional structure of alternating positive and negative ions (must name in questions)
What are the Two types of covalent compounds and the structure?
Simple covalent (molecular?) compound/molecules
Giant covalent compound
Differences between simple and covalent compounds
Simple covalent are in a fixed ratio [incomplete]
Types of structure?
Layered hexagonal rings of [element] atoms
Three dimensional network structure in a stable tetrahedral arrangement
