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Periodicity & Trends in the Periodic Table

Learn about periodicity and trends in the periodic table. Topics include periods and groups, ionization energy, atomic radius, electronegativity, and electron affinity.

Introduction to the Periodic Table
Learn how the periodic table of the elements is structured. Get basic history about its development and learn how periods and groups relate to electrons and atomic mass.

Groups of Elements
Elements can be categorized according to their similar properties. Here's a periodic table that organizes the elements according to groups. Click an element symbol and learn about the group to which it belongs.

Element Blocks
One way to group elements is by element blocks. Here is a look at what element blocks are and also properties and characteristics of the element blocks.

Increasing Atomic Number Doesn't Always Increase Atomic Mass
Learn why sometimes increasing the atomic number of an element doesn't necessarily increase its atomic mass.

Learn about electronegativity, the trends of electronegativity for elements in the periodic table, and how electronegativity relates to chemical bonding.

Ionic Radius Trends in the Periodic Table
Learn about the periodic table trends seen for the ionic radius of the elements.

Ionization Energy
Ionization energy is the energy required to remove an electron from an atom or ion in the gas state. Here's more information about what ionization energy is and what trends in ionization energy you can expect to see on the periodic table.

Periodic Table Trends - Periodic Table Quiz
Do you understand the trends of periodic table periodicity? Here's a ten question multiple choice quiz you can take to test your knowledge.

Periodic Properties of the Elements
Learn about the periodic properties or trends in the periodic table of the elements.

Metallic Character
Learn what is meant by the metallic character of an element and how metallic character changes as you move across a period or down a group in the periodic table.

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