MTL200 Midterm Exam Questions and
All Correct Answers 2026 Updated.
What are the three primary material eras? - Answer Stone Age, Bronze Age, Iron Age
What are the four levels of Material Structures? - Answer Subatomic Structures, Atomic
Structures, Micro structures, Macro structures
What are the three basic materials? - Answer Metals, Ceramics and Polymers
Advanced Materials - Answer semiconductors, biomaterials, smart materials, nanomaterials
atomic number - Answer the number of protons in the nucleus of an atom, usually equals the
number of neutrons
Isotope - Answer Atoms of the same element that have different numbers of neutrons
formula for atomic mass - Answer Atomic Number + Neutrons
mole - Answer the SI base unit used to measure the amount of a substance 6.022 x 10^23
Bohr's Atomic Model - Answer Atoms have levels surrounding the nucleus where electrons
are found. Levels can hold different amounts of electrons depending on their distance from the
nucleus.
Wave-Mechanical Model [Schrodinger's Model] - Answer Modern model of the atom, atoms
have electrons in "orbitals" that are like clouds around the nucleus
Quantum Numbers - Answer A set of four numbers that specify the properties of atomic
orbitals and the properties of electrons in orbitals
Principal Quantum Number (s) - Answer symbolized by n, indicates the main energy
level/shell occupied by the electron. N is the row in the periodic table
Secondary Quantum Number - Answer symbol = l; tells which sublevel the electron is on and
determines the shape of the orbital; sublevels are repetitively numbered and also lettered
, Valence Electrons - Answer The electrons in the outermost shell, which participate in the
bonding between atoms.
Pauli Exclusion Principle - Answer An atomic orbital may describe at most two electrons, each
with opposite spin direction
Bonding Energy - Answer The energy required to separate two atoms that are chemically
bonded to each other to an infinite distance
What does a column group represent in a periodic table? - Answer Similar valence electron
configurations/structure and chemical/physical properties
Electropositive Elements - Answer The elements have a tendency to release valence
electrons (metals) and have a low electronegativity
Electronegative Elements - Answer The elements having a tendency to accept valence
electrons (non-metals) and have a high electronegativity. [MC]
What is the general trend on the periodic table for increasing the Electronegativity? - Answer
The electronegativity usually increases from left to right and bottom to top. [MC]
Ionic Bonding and Directonality - Answer Chemical bonding that results from the electrical
attraction between cations and anions. Electron is given. Non-directional
Covalent Bonding and Directionality - Answer Covalent Bonding happens when electrons are
shared between two atoms and they have a similar electronegativity.
Covalend Bonds are directional
Metallic Bonding and Directionality - Answer In a metallic bond, the valence electrons are not
bound to a particular electron and can flow throughout the metal.
Metallic Bonds are non-directional.
Dipole - Answer created by equal but opposite charges that are separated by a short distance
Fluctuating Induced Dipole Bonds - Answer a fluctuating induced dipole bonds is a temporary
bond due to some atomic vibrations or motion.
Polar Molecule Induced Dipole Bonds - Answer A polar molecule induced bond happens
when two polar molecules are attracted to their opposite sides. [Water Molecule]
All Correct Answers 2026 Updated.
What are the three primary material eras? - Answer Stone Age, Bronze Age, Iron Age
What are the four levels of Material Structures? - Answer Subatomic Structures, Atomic
Structures, Micro structures, Macro structures
What are the three basic materials? - Answer Metals, Ceramics and Polymers
Advanced Materials - Answer semiconductors, biomaterials, smart materials, nanomaterials
atomic number - Answer the number of protons in the nucleus of an atom, usually equals the
number of neutrons
Isotope - Answer Atoms of the same element that have different numbers of neutrons
formula for atomic mass - Answer Atomic Number + Neutrons
mole - Answer the SI base unit used to measure the amount of a substance 6.022 x 10^23
Bohr's Atomic Model - Answer Atoms have levels surrounding the nucleus where electrons
are found. Levels can hold different amounts of electrons depending on their distance from the
nucleus.
Wave-Mechanical Model [Schrodinger's Model] - Answer Modern model of the atom, atoms
have electrons in "orbitals" that are like clouds around the nucleus
Quantum Numbers - Answer A set of four numbers that specify the properties of atomic
orbitals and the properties of electrons in orbitals
Principal Quantum Number (s) - Answer symbolized by n, indicates the main energy
level/shell occupied by the electron. N is the row in the periodic table
Secondary Quantum Number - Answer symbol = l; tells which sublevel the electron is on and
determines the shape of the orbital; sublevels are repetitively numbered and also lettered
, Valence Electrons - Answer The electrons in the outermost shell, which participate in the
bonding between atoms.
Pauli Exclusion Principle - Answer An atomic orbital may describe at most two electrons, each
with opposite spin direction
Bonding Energy - Answer The energy required to separate two atoms that are chemically
bonded to each other to an infinite distance
What does a column group represent in a periodic table? - Answer Similar valence electron
configurations/structure and chemical/physical properties
Electropositive Elements - Answer The elements have a tendency to release valence
electrons (metals) and have a low electronegativity
Electronegative Elements - Answer The elements having a tendency to accept valence
electrons (non-metals) and have a high electronegativity. [MC]
What is the general trend on the periodic table for increasing the Electronegativity? - Answer
The electronegativity usually increases from left to right and bottom to top. [MC]
Ionic Bonding and Directonality - Answer Chemical bonding that results from the electrical
attraction between cations and anions. Electron is given. Non-directional
Covalent Bonding and Directionality - Answer Covalent Bonding happens when electrons are
shared between two atoms and they have a similar electronegativity.
Covalend Bonds are directional
Metallic Bonding and Directionality - Answer In a metallic bond, the valence electrons are not
bound to a particular electron and can flow throughout the metal.
Metallic Bonds are non-directional.
Dipole - Answer created by equal but opposite charges that are separated by a short distance
Fluctuating Induced Dipole Bonds - Answer a fluctuating induced dipole bonds is a temporary
bond due to some atomic vibrations or motion.
Polar Molecule Induced Dipole Bonds - Answer A polar molecule induced bond happens
when two polar molecules are attracted to their opposite sides. [Water Molecule]
