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principle of engineering mats > Atomic Structure and Bonding > Flashcards

Atomic Structure and Bonding Flashcards

1
Q

Why study bonding?

A

The type of bond allows us to explain a materials properties

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2
Q

Describe atomic structure

A

consists of a nucleus and electrons, the nucleus has protons and neutrons

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3
Q

Have more neutrons than protons

A

isotopes

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4
Q

The atomic number represents what

A

of protons and electrons

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5
Q

Most commonly used atomic model

A

Bohr Atomic Model

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6
Q

What kind of properties do electrons have?

A

wavelike and particulate properties

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7
Q

What determines energy level of orbital?

A

quantum numbers

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8
Q

electrons tend to

A

occupy the lowest available energy state

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9
Q

electrons available for bonding

A

valence electrons

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10
Q

order of quantum energy level

A

K, L, M, and N

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11
Q

What type of material experiences ionic bonding?

A

Ceramics

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12
Q

What type of material experiences covalent bonding

A

Polymers

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13
Q

What type of material experiences metallic bonding?

A

Metals

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14
Q

What is required for Ionic bonding

A

Large difference in electronegativity

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15
Q

Is ionic bonding directional?

A

no, it is nondirectional

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16
Q

What kind of elements bond from ionic bonding?

A

Metal and nonmetal

17
Q

The force that drives attraction between electrons

A

Coulombic force (Coulombs law)

18
Q

Sharing electrons with similar electronegativities

A

Covalent bonding

19
Q

Dominate bonding between non metal atoms

A

Covalent

20
Q

is covalent bonding directional?

A

Yes

21
Q

Bonding that involves electron sharing and is nondirectional; valence electrons are loosely held by their parent nucleus and are attracted by surrounding nuclei

A

Metallic bonding

22
Q

Basis of high electrical conductivity

A

De-localized electrons (can move freely)

23
Q

Bonding that occurs without electron transfer

A

Secondary bonding

24
Q

How can fluctuating dipoles occur?

A

Asymmetric electron clouds

25
Q

When is melting temperature large

A

when the energy level is large

26
Q

When is the coefficient of thermal expansion larger?

A

If the energy is smaller

27
Q

Where does secondary bonding mostly take place?

A

Polymers

principle of engineering mats (10 decks)

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