Periodic Trends & Electron Configuration

Front

What is ionization energy?

Back

The energy required to remove an electron from an atom in its gaseous state.

Front

Which element has the highest ionization energy: helium, neon, or argon?

Back

Helium.

Front

What is the noble gas configuration for aluminum?

Back

[Ne] 3s² 3p¹.

Front

Which element has the highest shielding effect: lithium, sodium, or potassium?

Back

Potassium.

Front

What is the shielding effect?

Back

Reduction in attractive force between nucleus and valence electrons.

Front

What does the Aufbau Principle state?

Back

Electrons occupy orbitals of lowest energy first.

Front

What is Hund's Rule?

Back

Every orbital in a subshell is singly occupied before any orbital is doubly occupied.

Front

What is the Pauli Exclusion Principle?

Back

No two electrons in an atom can have the same set of four quantum numbers.

Front

How does atomic radius change across a period?

Back

Atomic radius decreases from left to right across a period.

Front

How does atomic radius change down a group?

Back

Atomic radius increases down a group.