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MTL200 Midterm Exam Questions and Answers 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? ...

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  • November 11, 2024
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MTL200 Midterm Exam Questions and Answers


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




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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



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