Chem exam 4
How many valence electrons do the halogens possess?
7
Identify the compound with the smallest percent ionic character HF LiF HCl IBr
IBr
Which one has smallest radius? N(-5) N(-2) N(0) N(+1) N(+3)
N(+3)
Pauli Exclusion Principle
No two electrons can have the same four quantum numbers
Which of the following ions is most stable using Lewis structure and formal charge? OCN(-) ONC(-) NOC(-)
OCN(-)
Aufbau principle
Only two electrons with opposing spins, are allowed in each orbital
What is the ground state electron configuration for Cr3+
[Ar]3d3?
Draw the best Lewis structure for CH3(+1). What is the formal charge on the C?
1
How many of the following molecules are polar? BrCl3 CS2 SiF4 SO3
1
Choose the bond below that is least polar C-F C-Cl C-Br C-I
C-I
What is the most reactive alkali metal with water? Li Na K Rb Cs
Cs
Determine the electron geometry and molecular geometry of CH3(+1)
Eg= Trigonal planar, mg= trigonal planar
Give the electron geometry, molecular geometry, and hybridization of NH3
Eg= tetrahedral, mg= trigonal pyramidal, sp3
Identify the shortest bond
Triple covalent bond
Hunds rule
When filling degenerate orbitals with electrons, fill them singly first sith parallel spins