MSE 2100

Ionic

Which bond type do the bonded atoms have large difference electronegativity?

True

In a neutral atom, the number of electrons and protons are equal.

Increases

As the degree of polymerization increases, the molecular weight _____.

DP=(Mn/m)

Quantum shell number

The rows in the Period Table correspond to _____.

Valence electrons

The columns (groups) in the Periodic Table correspond to ____.

Iron, Aluminum

Examples of metals

Oxygen, fluorine, selenium, neon

Examples of non-metals

smaller

What’s true about the size of Na and Na+ atoms? The radius of Na+ and Na are different, and the radius of Na+ is ____.

False

Do ceramics only contain pure ionic bonds?

BCC, FCC

Which of the following are metallic crystal structures?

K+, Ca2+ Cl-

Which elements have the same electronic configuration as Inert Gas Argon (Ar)?

Charge neutrality, ration of cation radius to anion radius

What are two factors influencing the ceramic crystal structure?

thermosets

What has a significant number of crosslinks?

Rock salt

What is the crystal structure of a material with AX structure and the coordination number of 6?

Secondary bonding

For linear polymers, what type of bonding occurs between adjacent linear chains?

Atactic structure

R groups randomly positioned (not very good for crystallization)

Syndiotactic structure

R groups alternate side of chain

isotactic

all R groups on the same side of the chain

Linear Polymers

What is it easy for to achieve crystallinity?

amorphous

Most crosslinked and network polymers are almost always ____.

Hydrogen bonding

Which type of bonding has the lowest bond energy in general?

Triple Nitrogen bonding

Which type of bonding has the highest bond energy in general?

family direction

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single direction

[]

single plane

()

family plane

{}

18

Max # of M shell

8

Max # L shell

2

Max # K shell

BCC

• Coordination number: 8

• APF: .68

• Edge length: a=(4r)/sqrt3

• Metals: Iron (room temp), chromium, tungsten, sodium, potassium

• Atoms/Cell: 2

FCC

• Coordination number: 12

• APF: .74

• Edge length: a=2sqrt2*r

• Metals: Aluminum, copper, gold, silver, nickel

• Other: 8 lattice points at each corner

• Atoms/Cell: 4

SC

• Coordination number: 6

• APF: .52

• Edge length: a=2r

• Metals: Polonium

• Atoms/Cell: 1