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