Class notes for MATL 260 Materials Science

Chapter 1

Oldmond is strongest natural material on

2 arm .

Uniform Micro-structives have the lowest hardness
and sirvest cooling .

types of materials:

Metals : "
strong eductive ·
Conductive (heat/electrical
·
reflective Mein' Lending a reflecte

Polymer/Plastic a covalent bonds . Selfi ,
low density
· Insularos Transircent
·




ceramics lonic and covalent bonds · brittle/clastic
· Insulators
(Meia + Non-metall -
Carbide ,
Oxide , nitride ,
sulfide


composite dow density woods


Transmittance : He transient a materia Is.

Chapter 2 :



quarium numbers :
ne principal K L M n
.
,
, .
0 energy lever
& coroital / Sip. d F .




M , magnetic ↓ .
3, 3 s )
-
101
M, (spin) -

,#When an arom has all energy levels filled, It is stable .


3d
=> Is 2


Pau : ex Pinciple : All energy levels receive
election before adding a second

Nobie gasses are most stable , they do not

have Valence elections .




Valence elections :
Elections In an un-filled
outer energy level.


Ionic bad : Metal t new-metal .
Metal denettes
elections to len-metal . Oxide ,
Chloride ,
fouride .




Energy En = EatER =
-
covalent bands : New-meters , Share Valence
electens to fill Over Shell
& rimary bonding : metallic bond, both lonic and covalent.
Hydrogen balding : Forms from hydrogen diposes.
Metallic bands : Metals

* higer melting Temp has higher boud energy

* If materials far on Periodic table , cand form
covalent lands.