2. Bonding and Properties Flashcards
What are the three material classes
- Metals
- Polymers
- Ceramics
define crystal structure
the arrangement of atoms at the microscopic level
How do the electrons behave in the Bohr atomic model?
- Electrons revolve around nucleus in discrete orbitals
- Electrons can only have specific energy levels
- Orbitals are separated by finite energies
How do the electrons behave in the Wave mechanical model model?
- Electrons exhibit both wave and particle behavior
- Position of an electron is described as a probability distribution at various locations around nucleus
- Electrons are described by four quantum numbers
Which way does electronegativity increase in the peroidic table?
from the bottom left to the top right
What are the 3 types of PRIMARY bonds?
- ionic
- covalent
- metallic
what is another name for SECONDARY bonds
Inter-molecular bonds
ionic bonds are between ____ and ___
metals and non metals
What is the directionality of ionic bonds?
non-directional
is the difference between electronegativities in ionically bonded atoms large or small
large
is the difference between electronegativities covalently bonded atoms large or small
small
what is the directionality of covalent bonds
directional bond (electrons are shared unevenly)
What happens to electrons in metallic bonding
the metals give up there electrons which then join the sea of electrons or electron cloud
why are metallically bonded elements good conductors
because the free moving electrons allow for good electrical and thermal conductivity
what is the directionality of metallic bonds?
non-directional
