Ch. 1-4 Exam Review

Ch. 1-4 Exam Review - Material types • Metal+ Alloys,...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Material types • Metal+ Alloys, Crematics + Glass, Semi-Conductors, Polymers, Composites Valence-Determined by the number of electrons in the outer most electron shell Atomic Number (Z) -number of protons in each atom Atomic Mass (A) -also called atomic weight, sum of the masses of protons and neutrons in the nucleus Avogadro’s Number (NA) 6.023 X 10 23 atoms/mole Electronegativity -The tendency of an atom to accept valence electrons, EN increases from left to right, bottom-top Primary Bonding- (electrons shared, transferred), Strong • Ionic Bonding- Occurs between + and –ions, Requires electron transfer, Large difference in electronegativity required,Example: NaCl • Covelent bonding- Requires shared electrons, Example: CH4,Covalently bonded materials form specific bonding angles depending on the material • Metallic Bond- Arises from a sea of donated valence electrons(1, 2, or 3 from each atom), Valence electrons are not bound to any particular atom, Primary bond for metals and their alloys, Good conductors of heat and electricity because of...
View Full Document

This note was uploaded on 04/17/2008 for the course MNUF 203 taught by Professor Fred during the Spring '08 term at Wisc Stout.

Page1 / 3

Ch. 1-4 Exam Review - Material types • Metal+ Alloys,...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online