Periodic Table: Element Guide

Periodic Table puts every chemical element at your fingertips, from hydrogen to oganesson, and adds molar mass and stoichiometry calculators for students, teachers, and anyone curious about chemistry.

• Browse the full 18-column table with separate lanthanide and actinide rows, or switch to a list
• Find elements by symbol, name, or atomic number as you type
• Filter by category or by state at room temperature: solid, liquid, or gas
• See atomic weight, electron configuration, electronegativity, melting and boiling points, and density
• Check period, group, block, and who discovered each element and when
• Spot alkali metals, halogens, noble gases, and other categories by color
• Copy or share an element's key data in one tap
• Calculate molar mass in g/mol with each element's mass percent, including formulas with parentheses, brackets, and hydrates such as CuSO4·5H2O
• Convert between grams and moles, find the limiting reagent, and work out theoretical and percent yield
• Balance chemical equations automatically
• Switch between Elements, Molar Mass, and Stoichiometry at the top of the screen

Names and atomic weights follow current IUPAC values.