Periodic Table
"Every element, one tap away."
Explore elementary atomic structural details, masses, and configs. Tap any of the 118 elements to see its atomic number, mass, electron configuration and state — search by name or filter by category to find exactly what you need.
- The two extra rows below the main table are the lanthanides and actinides — they belong in period 6 and 7, group 3, but are shown separately to keep the table a manageable width.
- Electron configurations use noble-gas shorthand, e.g. Sodium is written [Ne] 3s¹ instead of the full 1s² 2s² 2p⁶ 3s¹.
- Only bromine and mercury are liquid at room temperature — every other metal is solid.
- Search matches partial text, so typing "gen" finds Hydrogen, Oxygen, and Nitrogen at once.
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Understanding the Periodic Table's Layout
Why Elements Are Arranged This Way
The periodic table orders elements by increasing atomic number — the number of protons in the nucleus — arranged so that elements with similar chemical behavior line up in the same vertical column, called a group. Elements in the same row, or period, have the same number of electron shells.
Reading an Element's Details
Every element cell shows its atomic number, symbol, and atomic mass at a glance. Clicking through to the detail panel reveals its full electron configuration, category, and physical state at room temperature — everything needed for a typical chemistry assignment in one place.
The Lanthanides and Actinides
The two rows displayed below the main table — the lanthanides (57–71) and actinides (89–103) — technically belong within period 6 and period 7 respectively, in group 3. They're pulled out into separate rows purely to keep the table a manageable width; their position in the sequence of atomic numbers is unchanged.
Electron Configuration Shorthand
Rather than writing out every subshell from scratch, configurations here use noble-gas shorthand — for example, Chlorine is written [Ne] 3s² 3p⁵ instead of the full 1s² 2s² 2p⁶ 3s² 3p⁵, referencing the last noble gas that precedes it.
Who Uses This
- Students studying chemistry, from basic atomic structure through electron configuration.
- Teachers building quizzes, worksheets, or classroom reference displays.
- Anyone needing a quick lookup of an element's atomic mass or category.
- Test-takers reviewing periodic trends before an exam.
Element Categories Explained
Alkali metals and alkaline earth metals sit on the far left and react vigorously with water. Transition metals fill the central block. Metalloids straddle the line between metal and nonmetal. Halogens and noble gases occupy the far right, ranging from highly reactive to almost entirely inert.
A Note on the Newest Elements
Elements 113 through 118 were only formally named in 2016 and exist only as a handful of laboratory-synthesized atoms with extremely short half-lives — their listed properties, including physical state, are based on theoretical prediction rather than direct observation.