Quiz Review Flashcards
There are several classes of materials available for engineers. One of the major classes is polymers. What is the name of one if the other major classes weve discussed in class?
Ceramics or metals
The bohr model of atomic arrangement is currently the most adbanced model we currently have.
False
Write the possible sequence of values that the “Azimuthal Quantum” number I could take:
0, 1, 2, 3
s, p, d, f
Which quantum number relates to the size of an atom:
n
The position of electrons has an influence on the type of bonding that can occur between neighboring atoms:
True
What is the name of a positively charged ion?
Cation
In general, the higher the bond force between atoms then the higher the ____ temperature of the substance
Melting
What type of a bond results from the sharing of valence electrons
Covalent
Consider teo elements. Element A has the highest value of n=2, while element B has the highest value n=3. If both elements from a BCC structure in which case would you expect the BCC lattice parameter to be smaller?
Element B
Consider an atom which is not at its equilibrium state. Specifically the atom has more protons than neutrons (with respect to its equilibrium state) in that case the atom can be called an:
Isotope
Chlorine has an eectron configuration of 1s^2 2s^2 2p^6 3s^2 3p^5. What is the value of the principal quantum number
3
What is the name of a negatively charged ion?
Anion
When two elements bond an electropositive element:
Donates an electron
The “pauli exclusion principle” tells us that two electrons traveling in the same orbit around a nucleus will have opposite spin:
True
Consider two elements. Element A has the highest value of n =2 while element B has the highest value n =3. If both elements form a FCC structure in which case would you expect the FCC lattice parameter to be bigger
Element B
Which quantum njmber relates to the shape of the trajectory an electron takes while orbiting a nucleus
l
How many neutrons are present in a neutral silicon atom, which has an atomic number = 14, and has the following electron configuration 1s^2 2s^2 2p^6 3s^2 3p^2
14
The electron configuration for Bromine is 1s^2 2s^2 2p^6 3s^2 3p^6 3d^10 4s^2 4p^5
1s^2 2s^2 2p^6 3s^2 3p^6 3d^10 4s^2 4p^4
Bromine is able to have several isotopes. This means that a Bromine isotope will have a:
Varying number of neutrons than an equilibrium Bromine atom
In “Van der Waals” bonding, a bond is created between two atoms due to:
Proximity of two atoms
The electron configuration for an atom of oxygen is 1s^2 2s^2 2p^4. Write the electron configuration for an O^-2 ion:
1s^2 2s^2 2p^2
What type of bonding would be expected for rubber (chemical formula C3H8)
Covalent Bonding
A positively charged ion is called
Cation
The higher thr melting temperature of a material, the greater the:
Bonding strength between atoms
When we talked about crystal structure in class we made an assumption that the individual atoms in a given unit cell were touching
True
In class, we’ve discussed that there are several ways to examine the structure of material. Which one of the following would be feasible to evaluate with a naked eye
Macrostructure
The electrons located in the outermost shell of an atom are often called _________ valence electrons.
Valence
Write the possible sequence of values that the principal quantum number n could take
1 2 3 4
K L M N
A negatively charged ion is called
Anion
The number of protons and neutrons in the nucleus is labeled using the following letter:
A
The electron configuration for an atom of Argon is 1s^2 2s^2 2p^6 3s^2 3p^6. How many electrons are in the valance shell?
8
What is the highest coordination number that can be achieved?
12
In general when bonds form the actual distance between two atoms is an equilibrium distance caused by the bond force. The bond force depends on the:
Attractive force between one nucleus and one electron cloud, and the repulsive force between two electron clouds
The electron configuration for an atom of oxygen is 1s^2 2s^2 2p^4. Write the electron configuration for an O^-2 ion
1s^2 2s^2 2p^2
Atoms that have full valence shells are often most reactive
False
FCC and BCC lattices both have a cubic crystal unit cell. As a result the lattice parameter of these two cubic systems in the same
False
In a given BCC crystal, the spacing between adjacent (110) planes is less than the spacing between adjacent (120) planes
False