Periodic Table Explorer
Element Categories
Alkali Metals
Alkaline Earth
Metals
Metalloids
Nonmetals
Halogens
Noble Gases
Element Details
Click on any element to explore its properties, facts, and chemical information.
Understanding the Periodic Table
The periodic table organizes all known chemical elements by their atomic number (number of protons). Elements with similar properties are grouped together in columns called groups or families.
Horizontal rows are called periods, and elements in the same period have the same number of electron shells.
The table reveals patterns in atomic properties and helps predict how elements will behave in chemical reactions.
Key Concepts
Atomic Structure
- • Protons: Positive particles in nucleus
- • Neutrons: Neutral particles in nucleus
- • Electrons: Negative particles in shells
- • Atomic number = Number of protons
Periodic Trends
- • Atomic size decreases across periods
- • Ionization energy increases across periods
- • Metallic character decreases across periods
- • Similar properties in same groups
Periodic Table FAQ
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