MTL 200 Final Exam Questions with
Guaranteed Pass Solutions 2026
Updated.
What is an isotope? - Answer Atoms of the same element that have different numbers of
neutrons
What is the Pauli Exclusion Principle? - Answer each electron state can hold no more than
two electrons which must have opposite signs
What is the Stable Electron Configuration? - Answer the state within the outermost shell
completely filled (ex. inert gases: He, Ne, Ar, etc)
What is bonding energy? - Answer 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? - Answer Nondirectional:
ionic bonding, metallic bonding
Directional: covalent bonding
What is the difference between directional and nondirectional bonding? - Answer
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? - Answer a = unit cell edge length
R = atomic radius
a = 2Rsqrt(2)
How many atoms are in the FCC structure? - Answer 4 atoms
What is the relationship between the unit cell edge length and the atomic radius for BCC crystal
structures? - Answer a = (4R)/sqrt(3)
How many atoms are in the BCC structure? - Answer 2 atoms
, What is the relationship between the unit cell edge length and the atomic radius for HCP crystal
structures? - Answer a = 2R
How many atoms are in the HCP structure? - Answer 6 atoms
What is the formula for volume of HCP unit cell in terms of a and c? - Answer V=
(3ca^2sqrt(3))/2
What are the coordination numbers of FCC, BCC, and HCP structures? - Answer FCC: 12
BCC: 8
HCP: 12
What are the APF of FCC, BCC, and HCP structures? - Answer 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? - Answer V=4*(4/3)(piR^3)
What is polymorphism? What is it called for elements? - Answer - 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? - Answer Cubic structures: [UVW]
Hexagonal structures: [uvtw]
Family of equivalent directions: <uvw> <uvtw>
How do you convert [UVW] to [uvtw]? - Answer u = (1/3)(2U-V)
v = (1/3)(2V-U)
t = -(u+v)
w=W
What is the formula for linear density (LD)? - Answer LD = (# of atoms centered on a direction
vector)/(length of direction vector)
What kind of brackets are used for linear? ( ) or [ ]? - Answer []
Guaranteed Pass Solutions 2026
Updated.
What is an isotope? - Answer Atoms of the same element that have different numbers of
neutrons
What is the Pauli Exclusion Principle? - Answer each electron state can hold no more than
two electrons which must have opposite signs
What is the Stable Electron Configuration? - Answer the state within the outermost shell
completely filled (ex. inert gases: He, Ne, Ar, etc)
What is bonding energy? - Answer 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? - Answer Nondirectional:
ionic bonding, metallic bonding
Directional: covalent bonding
What is the difference between directional and nondirectional bonding? - Answer
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? - Answer a = unit cell edge length
R = atomic radius
a = 2Rsqrt(2)
How many atoms are in the FCC structure? - Answer 4 atoms
What is the relationship between the unit cell edge length and the atomic radius for BCC crystal
structures? - Answer a = (4R)/sqrt(3)
How many atoms are in the BCC structure? - Answer 2 atoms
, What is the relationship between the unit cell edge length and the atomic radius for HCP crystal
structures? - Answer a = 2R
How many atoms are in the HCP structure? - Answer 6 atoms
What is the formula for volume of HCP unit cell in terms of a and c? - Answer V=
(3ca^2sqrt(3))/2
What are the coordination numbers of FCC, BCC, and HCP structures? - Answer FCC: 12
BCC: 8
HCP: 12
What are the APF of FCC, BCC, and HCP structures? - Answer 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? - Answer V=4*(4/3)(piR^3)
What is polymorphism? What is it called for elements? - Answer - 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? - Answer Cubic structures: [UVW]
Hexagonal structures: [uvtw]
Family of equivalent directions: <uvw> <uvtw>
How do you convert [UVW] to [uvtw]? - Answer u = (1/3)(2U-V)
v = (1/3)(2V-U)
t = -(u+v)
w=W
What is the formula for linear density (LD)? - Answer LD = (# of atoms centered on a direction
vector)/(length of direction vector)
What kind of brackets are used for linear? ( ) or [ ]? - Answer []
