Revision in Chem

The quantum mechanical model of the atom describes electrons as:

• Particles in fixed orbits

• Particles with defined mass but no charge

• Waves spread across a probability cloud

• Objects that lose energy over time

Mendeleev arranged the elements in his periodic table by:

• Increasing atomic number

• Decreasing atomic mass

• Increasing atomic mass

• Decreasing electron affinity

What is the maximum number of electrons that can occupy the third energy level?

• 2

• 8

• 18

• 32

An atom with a full outer shell is generally:

• More reactive than one with unfilled orbitals

• Less reactive than one with unfilled orbitals

• Equally reactive as one with unfilled orbitals

• Unstable and highly reactive

Which statement is true about orbitals in a given shell?

• All orbitals in the same shell have the same energy

• p orbitals have lower energy than s orbitals

• Orbitals in the same shell have different energies

• All orbitals must be filled in each shell

According to Coulomb's Law, the force of attraction between two charged particles:

• Increases as the distance between them increases

• Increases as the distance between them decreases

• Remains the same regardless of distance

• Decreases as the charge increases

The second energy level can hold:

• Only s orbitals

• Only p orbitals

• Both s and p orbitals

• s, p, and d orbitals

Coulomb's Law applies to:

• Only protons and neutrons

• Only electrons and neutrons

• Protons and electrons, but not neutrons

• All subatomic particles

Where are valence electrons located in an atom?

• In the innermost energy level

• In the outermost energy level

• In the nucleus

• In the second energy level only

The s orbital can hold a maximum of:

• 2 electrons

• 6 electrons

• 10 electrons

• 14 electrons