Elements & Isotopes

These tools let you look up and calculate the properties of the elements themselves. The periodic table shows the atomic weight, electron configuration, category, and melting and boiling points of all 118 elements in a clickable grid, and the half-life calculator works out the remaining amount or the elapsed time from the half-life formula.

Periodic Table of Elements — Search & Detailed Data for All 118 Elements

Look up every element from hydrogen to oganesson: search or browse the periodic table for atomic number, atomic mass, category, electron configuration, and melting/boiling points.

Radioactive Isotope Half-Life Calculator

Using the half-life formula N=N0×(1/2)^(t/T), calculate any one of remaining amount, initial amount, elapsed time, or half-life from the other three.