Interactive Periodic Table
All 118 elements · phase slider · electron shells · quiz mode · trends
Element Comparison
The periodic table contains 118 confirmed elements, from Hydrogen (atomic number 1) to Oganesson (atomic number 118). Elements 113-118 were officially named by IUPAC in 2016. Scientists continue to attempt synthesis of elements 119 and beyond.
Elements are grouped into categories based on their chemical and physical properties: alkali metals, alkaline earth metals, transition metals, post-transition metals, metalloids, reactive nonmetals, halogens, noble gases, lanthanides, and actinides. Each category shares similar electron configurations and reactivity patterns.
Electronegativity measures an atom's ability to attract shared electrons in a chemical bond, using the Pauling scale. Fluorine has the highest electronegativity (3.98) while Francium has the lowest (~0.7). Electronegativity generally increases across a period (left to right) and decreases down a group (top to bottom). Noble gases are typically excluded as they rarely form bonds.
The phase slider lets you set any temperature from 0 K to 6000 K. Each element on the table is then color-coded based on whether it is solid (blue), liquid (red), or gas (green) at that temperature, using real melting and boiling point data. Elements with unknown phase data are shown in gray.
An electron shell diagram shows how electrons are distributed across energy levels (shells) around an atom's nucleus. The first shell holds up to 2 electrons, the second up to 8, the third up to 18, and the fourth up to 32. Click any element to see its electron shell diagram visualized with concentric rings.
This tool visualizes three key trends: electronegativity (tendency to attract electrons), atomic radius (size of atoms), and ionization energy (energy needed to remove an electron). Each trend is shown as a color gradient overlaid on the periodic table, making patterns across periods and groups immediately visible.
Click the Compare tab, then click any two elements on the table. Their properties — including atomic mass, density, melting point, boiling point, electronegativity, electron configuration, and discovery year — are displayed side-by-side for easy comparison.
Three quiz modes test different aspects of your periodic table knowledge: Find by Name (click the correct element on the table), Name from Symbol (type the element name given its symbol), and Identify by Number (type the element name given its atomic number).
Lanthanides (elements 57-71) and actinides (elements 89-103) are placed below the main table by convention to keep the table compact. If inserted in their true positions (period 6 group 3 and period 7 group 3), the table would be 32 columns wide, making it impractical to display.
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