Valence electrons
Resonance and Formal Charges
VSEPR
Crystal Lattice
Which Lewis Structure?
100
Aluminum has this many valence electrons
What is 3
100
Resonance structures share the same:
What are formal charges
OR
What are arrangement of atoms
100
Molecular geometry for a water molecule
What is bent?
100
This is the force that holds together an ionic lattice
electrostatic force (between positive and negative ions)
100
Where is the +1 formal charge?
200
The molecule CH4 has a total of how many valence electrons
What is 8.
200
When writing resonance structures, what are two things you should always include.
brackets, double arrows, formal charges, electron pushing arrows
200
Molecular geometry for an ammonia molecule
What is trigonal pyramidal?
200
What is one factor that determines the strength of an ionic bond?
atomic radius, charge
200
What is the overall charge on this molecule:
what is the overall charge on this?
H2SO4 - no charge
300
An example of an element that can have greater than an octet of electrons in Lewis structures
P, S, Cl, etc etc.
300
If a sulfur atom has two unpaired electrons around it, how many bonds must it have in order to have a formal charge of 0?
What is 4.
300
VSEPR shape of SF6
octahedral
300
NaF or NaI
NaF because F has the smaller atomic radii
300
Which of these structures would be able to have resonance? Left or Right?
Left
400
If an ion has a negative charge, when determining the total number of valence electrons in the ion, one must:
add electrons equal to the charge.
400
The ozone molecule, O3, has this many resonance structures.
What is 2.
400
Molecular geometry for an ammonium molecule
What is tetrahedral?
400
Higher melting point: NaF or H2O
NaF
400
Which is the most likely molecular structure for the nitrite (NO2−) ion?
500
Name an element that, when in a molecule, can have less than 8 valence electrons associated with it.
What is H, He, B, or Be.
500
For a neutral molecule, the sum of formal charges is equal to:
0
500
Nitrogen triiodide has this VSEPR Shape
trigonal pyramidal
500
Higher melting point: CaCl2 or NaCl
Calcium chloride (CaCl₂) has a higher melting point than sodium chloride (NaCl) because the calcium ion (Ca²⁺) has a higher charge than the sodium ion (Na⁺), leading to stronger ionic bonds and a higher lattice energy.
500
using formal charges, which is most likely to exist? (Hint: N is more electronegative than S)
(b) less formal charges than (c) & N is more electronegative than S