Unit 3 Review: Periodic Table and Electron Configuration

Front

What is the predominant factor when comparing elements in the same group on the periodic table?

Back

Number of energy levels / shells.

Front

Which statement is TRUE regarding atomic radius across a period?

Back

Atomic radius decreases across a period.

Front

How do valence electrons behave when they absorb or emit energy?

Back

They move to a higher energy level when absorbing energy and drop to a lower energy level when emitting energy.

Front

How many valence electrons are in the electron configuration 1s² 2s² 2p⁶ 3s² 3p³?

Back

5.

Front

What is the electron configuration of a neutral oxygen atom?

Back

1s² 2s² 2p⁴.

Front

Define electronegativity.

Back

Electronegativity is the tendency of an atom to attract electrons in a chemical bond.

Front

What is the trend of electronegativity in the periodic table?

Back

Electronegativity increases across a period and decreases down a group.

Front

What is the shielding effect?

Back

The shielding effect is the reduction in effective nuclear charge on the electron cloud, due to the presence of other electrons.

Front

How does ionization energy change across a period?

Back

Ionization energy increases across a period.

Front

What is the relationship between atomic radius and ionization energy?

Back

As atomic radius decreases, ionization energy increases.