CHEM 3121 Exam 1 Review

Atomic Orbitals and Quantum Numbers

100

This type of atomic orbital has 2 lobes with opposite phases, and is often described as the shape of a dumbell.

What is a p orbital?

200

The number of electrons in a single atom with the quantum numbers n = 3, l = 1, and  m_l = 2. 

What is zero?

300

This quantum number tells us about an orbital's orientation in space.

What is the magnetic quantum number (m_l)? 

400

The number of nodal spheres (radial nodes) in a 4p orbital.

What is 2?

500

The number of hypothetical h orbitals in the n = 6 shell.

What is 11?

The Periodic Table and Electron Configurations

100

This alkaline earth metal's common ion has the same electron configuration as krypton (Kr).

What is strontium (Sr)?

200

The first element in the chalcogen group.

What is oxygen?

300

The number of electrons in orbitals with l = 1 in a bromide (Br^-) ion.

What is 18? 

400

The estimated effective nuclear charge (Z_eff) experienced by a valence electron in a calcium atom.

What is 2?

500

This Period 3 element has the following successive ionization energies (in units of kJ/mol): 

737.7;  1450.7;   7732.7;  10,542.5;  13,630

What is magnesium?

Lewis Structures and Geometry

100

The central atom in the structure of nitrosyl fluoride (NOF).

What is N?

200

The formal charge on oxygen in the nitrosonium ion, NO⁺.

What is +1? 

300

The number of lone pairs on krypton in KrI₃^-.

What is 3? 

400

The molecular geometry of XeF₄.

What is square planar? 

500

The electron geometry of SO₂.

What is trigonal planar?

Molecular Symmetry

100

The principal rotation axis for PBr₅.

What is C₃?

200

The total number of mirror planes in benzene.

What is 7?

300

The point group for 1,4-dichlorobenzene (p-dichlorobenzene).

What is D_2h?

400

The point group for N₂O.

What is C_∞v?

500

The point group for a d_z² orbital.

What is D_∞h?

Molecular Orbital Theory

100

The type of molecular orbital formed by the linear combination of s atomic orbitals on two atoms.

What is sigma? 

200

The bond order for a molecule with 4 electrons in bonding MOs and 2 electrons in antibonding MOs.

What is 1?

300

The effect on bond strength that occurs when an electron is added to a bonding molecular orbital. 

What is increasing (strengthening)? 

400

The number of unpaired electrons in a molecule of diboron, B₂. 

What is 2? 

500

This d orbital will form pi bonding/antibonding MOs with a p_x orbital when z is the internuclear (bonding) axis.

What is d_xz?