MTL200 MIDTERM EXAM QUESTIONS
WITH 100% CORRECT ANSWERS
LATEST VERSION 2025/2026.
What are the three primary material eras? - ANS Stone Age, Bronze Age, Iron Age
What are the four levels of Material Structures? - ANS Subatomic Structures, Atomic
Structures, Micro structures, Macro structures
What are the three basic materials? - ANS Metals, Ceramics and Polymers
Advanced Materials - ANS semiconductors, biomaterials, smart materials, nanomaterials
atomic number - ANS the number of protons in the nucleus of an atom, usually equals the
number of neutrons
Isotope - ANS Atoms of the same element that have different numbers of neutrons
formula for atomic mass - ANS Atomic Number + Neutrons
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, mole - ANS the SI base unit used to measure the amount of a substance 6.022 x 10^23
Bohr's Atomic Model - ANS 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] - ANS Modern model of the atom, atoms
have electrons in "orbitals" that are like clouds around the nucleus
Quantum Numbers - ANS A set of four numbers that specify the properties of atomic orbitals
and the properties of electrons in orbitals
Principal Quantum Number (s) - ANS symbolized by n, indicates the main energy level/shell
occupied by the electron. N is the row in the periodic table
Secondary Quantum Number - ANS 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 - ANS The electrons in the outermost shell, which participate in the
bonding between atoms.
Pauli Exclusion Principle - ANS An atomic orbital may describe at most two electrons, each
with opposite spin direction
Bonding Energy - ANS The energy required to separate two atoms that are chemically
bonded to each other to an infinite distance
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
WITH 100% CORRECT ANSWERS
LATEST VERSION 2025/2026.
What are the three primary material eras? - ANS Stone Age, Bronze Age, Iron Age
What are the four levels of Material Structures? - ANS Subatomic Structures, Atomic
Structures, Micro structures, Macro structures
What are the three basic materials? - ANS Metals, Ceramics and Polymers
Advanced Materials - ANS semiconductors, biomaterials, smart materials, nanomaterials
atomic number - ANS the number of protons in the nucleus of an atom, usually equals the
number of neutrons
Isotope - ANS Atoms of the same element that have different numbers of neutrons
formula for atomic mass - ANS Atomic Number + Neutrons
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, mole - ANS the SI base unit used to measure the amount of a substance 6.022 x 10^23
Bohr's Atomic Model - ANS 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] - ANS Modern model of the atom, atoms
have electrons in "orbitals" that are like clouds around the nucleus
Quantum Numbers - ANS A set of four numbers that specify the properties of atomic orbitals
and the properties of electrons in orbitals
Principal Quantum Number (s) - ANS symbolized by n, indicates the main energy level/shell
occupied by the electron. N is the row in the periodic table
Secondary Quantum Number - ANS 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 - ANS The electrons in the outermost shell, which participate in the
bonding between atoms.
Pauli Exclusion Principle - ANS An atomic orbital may describe at most two electrons, each
with opposite spin direction
Bonding Energy - ANS The energy required to separate two atoms that are chemically
bonded to each other to an infinite distance
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
