MTL 200 Need to Know Questions and Correct Answers/ Latest Update / Already Graded

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MTL 200 Need to Know Questions and Correct Answers/ Latest Update / Already Graded

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What is an isotope? Ans: Atoms of the same element that have different numbers of neutrons What is the Pauli Exclusion Principle? Ans: each electron state can hold no more than two electrons which must have opposite signs What is the Stable Electron Configuration? Ans: the state within the outermost shell completely filled (ex. inert gases: He, Ne, Ar, etc) What is bonding energy? Ans: the energy required to separate two atoms that are chemically bonded to an infinite distance (units: kJ/mol or eV/atom) Which kinds of bonds are nondirectional? Which are directional? Page | 2 All rights reserved © 2025/ 2026 | Ans: Nondirectional: ionic bonding, metallic bonding Directional: covalent bonding What is the difference between directional and nondirectional bonding? Ans: Nondirectional: magnitude of the bond is equal in all directions around an ion Directional: atoms need to be in a specific orientation What is the relationship between the unit cell edge length and the atomic radius for FCC crystal structures? Ans: a = unit cell edge length R = atomic radius a = 2Rsqrt(2) How many atoms are in the FCC structure? Ans: 4 atoms What is the relationship between the unit cell edge length and the atomic radius for BCC crystal structures? Ans: a = (4R)/sqrt(3) Page | 3 How many atoms are in the BCC structure? Ans: 2 atoms What is the relationship between the unit cell edge length and the atomic radius for HCP crystal structures? Ans: a = 2R How many atoms are in the HCP structure? Ans: 6 atoms

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MTL 200 Need to Know Questions and
Correct Answers/ Latest Update / Already
Graded
What is an isotope?

Ans: Atoms of the same element that have different numbers
of neutrons

What is the Pauli Exclusion Principle?

Ans: each electron state can hold no more than two electrons
which must have opposite signs

What is the Stable Electron Configuration?

Ans: the state within the outermost shell completely filled (ex.
inert gases: He, Ne, Ar, etc)

What is bonding energy?

Ans: the energy required to separate two atoms that are
chemically bonded to an infinite distance (units: kJ/mol or
eV/atom)

Which kinds of bonds are nondirectional? Which are directional?

All rights reserved © 2025/ 2026 |

, Page |2

Ans: Nondirectional: ionic bonding, metallic bonding
Directional: covalent bonding

What is the difference between directional and nondirectional
bonding?

Ans: Nondirectional: magnitude of the bond is equal in all
directions around an ion
Directional: atoms need to be in a specific orientation

What is the relationship between the unit cell edge length and the
atomic radius for FCC crystal structures?

Ans: a = unit cell edge length
R = atomic radius
a = 2Rsqrt(2)

How many atoms are in the FCC structure?

Ans: 4 atoms

What is the relationship between the unit cell edge length and the
atomic radius for BCC crystal structures?

Ans: a = (4R)/sqrt(3)

All rights reserved © 2025/ 2026 |

, Page |3

How many atoms are in the BCC structure?

Ans: 2 atoms

What is the relationship between the unit cell edge length and the
atomic radius for HCP crystal structures?

Ans: a = 2R

How many atoms are in the HCP structure?

Ans: 6 atoms

What is the formula for volume of HCP unit cell in terms of a and c?

Ans: V = (3ca^2sqrt(3))/2

What are the coordination numbers of FCC, BCC, and HCP structures?

Ans: FCC: 12
BCC: 8
HCP: 12

What are the APF of FCC, BCC, and HCP structures?

All rights reserved © 2025/ 2026 |

, Page |4

Ans: FCC: 0.74 or 74%
BCC: 0.68 or 68%
HCP: 0.74 or 74%

What is the formula for the volume of 4 atoms in FCC?

Ans: V=4*(4/3)(piR^3)

What is polymorphism? What is it called for elements?

Ans: - the phenomenon of a solid material existing in more
than one form of crystal structure.
- for elements, it is called allotropy

What coordinate form do you use for crystallographic directions for
cubic structures, hexagonal structures and for a family of equivalent
directions?

Ans: Cubic structures: [UVW]
Hexagonal structures: [uvtw]
Family of equivalent directions: <uvw> <uvtw>

How do you convert [UVW] to [uvtw]?

Ans: u = (1/3)(2U-V)

All rights reserved © 2025/ 2026 |

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Number of pages: 34
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Type: Exam (elaborations)
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