AP Chemistry Flashcards: Periodic Trends
Written by AP Content Team, Verified for 2026 AP Exams, Last updated: May 2026
Review key ideas with interactive flashcards. This set includes 10 cards to help you master important concepts.
Why are properties of elements considered 'periodic'?
Properties are considered periodic because they recur in a predictable pattern as you move across the periodic table, a phenomenon explained by repeating electron configurations.
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Why are properties of elements considered 'periodic'?
Properties are considered periodic because they recur in a predictable pattern as you move across the periodic table, a phenomenon explained by repeating electron configurations.
What is the relationship between an element's electronic structure and its atomic properties?
Trends in the atomic properties of elements are a direct consequence of their electronic structure and the periodic repetition of their electron configurations.
What four principles are used to qualitatively understand and predict periodic trends?
Periodic trends can be understood using Coulomb's law, the shell model, shielding, and effective nuclear charge.
What is the fundamental basis for the organization of the periodic table?
The periodic table's organization is based on recurring elemental properties, which are explained by patterns in ground-state electron configurations and the filling of electron shells.
How does the shell model help explain periodic trends?
The shell model explains periodicity by showing how electrons occupy distinct energy levels (shells), and the filling of these shells dictates an element's properties and position on the table.
How can Coulomb's Law be applied to understand ionization energy trends?
Coulomb's Law helps explain that as effective nuclear charge increases or distance from the nucleus decreases, the attraction to an outer electron is stronger, thus requiring more energy to remove it (higher ionization energy).
What are the four key periodic trends mentioned?
The key periodic trends are ionization energy, atomic/ionic radii, electron affinity, and electronegativity.
Effective Nuclear Charge
A concept used to explain periodic trends, representing the net positive charge experienced by an electron in a multi-electron atom, considering the shielding effect of other electrons.
How can periodicity be useful when specific data for an element is missing?
Periodicity allows one to predict or estimate the values of an element's properties by observing the trends of neighboring elements in the absence of direct data.
How does an element's position on the periodic table help in understanding its properties?
An element's position allows for the prediction of its periodic trends (like electronegativity or atomic radius) based on established patterns across periods and down groups.