Periodic Table of the Elements
About This Tool
This interactive periodic table covers all 118 confirmed elements, from Hydrogen (Z = 1) to Oganesson (Z = 118), including the lanthanide and actinide series. Clicking any element displays its atomic number, atomic mass (in unified atomic mass units, u), ground-state electron configuration, electronegativity on the Pauling scale, standard phase at STP, and melting and boiling points in Celsius. Elements are colour-coded by category (alkali metals, alkaline earth metals, transition metals, post-transition metals, metalloids, nonmetals, halogens, noble gases, lanthanides, and actinides) as visible in the legend. Atomic masses are based on IUPAC recommended values; electronegativity and thermodynamic data are not available for all elements, particularly the heavier synthetic ones.