Week 1 Flashcards
The nucleus of an atom contains
Protons and Neutrons
What type(s) of electron subshell(s) does an L shell contain?
s and p
What is the maximum number of electrons that an M shell may contain?
18
The electrons that occupy the outermost filled shell are called __________ electrons.
Valence
An element with the electron configuration 1s2 2s2 2p6 3s2 3p6 has how many electrons?
18
Match the electron structure below with the element type it represents.
1s22s22p63s23p64s1
Alkali metal
What is the predominant type of bonding for titanium (Ti)?
Metallic
How do you calculate the calculate the ionic character of a substance
% ionic character = 1− e ^(− (XA−XB)^2)/4
where XA & XB are Pauling electronegativities
Mixed primary bonding
x (100%)
What does the quantum number n stand for
principal quantum number
What does the quantum number l stand for
subshells
What does the quantum number ml stand for
no. of energy states in subshell
What does the quantum number ms stand for
spin moment
What are the electronic configuration letters
n, p, d, f
What is the typical bonding type for ceramics
ionic bonding
Are metallic substances good conductors
yes
What type of secondary bonding occurs in polymers
Van der waals bond (weak electrostatic attraction)
Bonding energy: what type of bonds are non directional
ionic and mettallic
Bonding energy: what type of bonds are directional
Covalent and secondary
If the bond strength has i high melting point and energy will the co-efficient of thermal expansion be large or small
small
do polymers have a high or low melting point
low
Atoms are packed densely when they are
crystalline
What does amorphous mean
non crystalline
What is a unit call
smallest cell that completely describes the lattice
How many crystal systems are there?
7
