MTL 200 EXAM REVIEW
QUESTIONS AND 100% CORRECT
ANSWERS!!
(1) Three basic classifications of materials are
Metals, ceramics and polymers
(2) The maximum number of electrons accommodated by p subshell is
6
(3) Pauli exclusion principle specifies that
(d) each electron state can hold no more than two electrons, which must have opposite spins.
(4) Which type of bonding belongs to the secondary bonding?
Hydrogen Bonding
(5) The coordination number in the unit cell of hexagonal close-packed (HCP)
crystal structure is
12
(6) The stacking sequence of close-packed planes in the form of ABCABCABC... is for
FCC
(7) Four main factors affecting the solubility of the substitutional solid solution are
Atomic Size, Crystal Structure, Electronegativity, Valence
(8) Two basic types of grain boundaries are
High angle grain boundary and low angle grain boundary
(9) Two types of main diffusion mechanisms are
, Vacancy Diffusion and Interstitial Diffusion
(10) The driving force in the steady-state diffusion is
Concentration Gradient
(1) Atomic weight is the weighted average of the atomic masses of an atom's
naturally occurring isotopes.
True
(2) The larger the principal quantum number, the higher the energy level.
True
(4) Electronegativity in the periodic table increases from left to right and from top
to bottom..
False (Bottom to Top)
(5) Bonding energy is the energy required to separate two atoms that are chemically
bonded to an infinite distance.
True
(6) Ionic bonding is directional.
False (Non-directional)
(7) The coordination number in the body-centered cubic (BCC) unit cell is 8.
TRUE/FALSE
True
(8) In the section of crystallographic directions and planes, the braces {} indicate a family
of equivalent directions.
False [ This does]
(9) The stacking sequence of the close-packed planes in the hexagonal close-packed
(HCP) crystal structure is ABABABABAB...
QUESTIONS AND 100% CORRECT
ANSWERS!!
(1) Three basic classifications of materials are
Metals, ceramics and polymers
(2) The maximum number of electrons accommodated by p subshell is
6
(3) Pauli exclusion principle specifies that
(d) each electron state can hold no more than two electrons, which must have opposite spins.
(4) Which type of bonding belongs to the secondary bonding?
Hydrogen Bonding
(5) The coordination number in the unit cell of hexagonal close-packed (HCP)
crystal structure is
12
(6) The stacking sequence of close-packed planes in the form of ABCABCABC... is for
FCC
(7) Four main factors affecting the solubility of the substitutional solid solution are
Atomic Size, Crystal Structure, Electronegativity, Valence
(8) Two basic types of grain boundaries are
High angle grain boundary and low angle grain boundary
(9) Two types of main diffusion mechanisms are
, Vacancy Diffusion and Interstitial Diffusion
(10) The driving force in the steady-state diffusion is
Concentration Gradient
(1) Atomic weight is the weighted average of the atomic masses of an atom's
naturally occurring isotopes.
True
(2) The larger the principal quantum number, the higher the energy level.
True
(4) Electronegativity in the periodic table increases from left to right and from top
to bottom..
False (Bottom to Top)
(5) Bonding energy is the energy required to separate two atoms that are chemically
bonded to an infinite distance.
True
(6) Ionic bonding is directional.
False (Non-directional)
(7) The coordination number in the body-centered cubic (BCC) unit cell is 8.
TRUE/FALSE
True
(8) In the section of crystallographic directions and planes, the braces {} indicate a family
of equivalent directions.
False [ This does]
(9) The stacking sequence of the close-packed planes in the hexagonal close-packed
(HCP) crystal structure is ABABABABAB...
