Numbers & science
Periodic Table of the Elements
All 118 elements, with atomic numbers, symbols, names, approximate weights and searchable categories.
118 confirmed elements. Select any element to see its atomic number, name, symbol and approximate atomic weight or isotope mass number. Scroll horizontally on a phone to see the whole periodic table.
Select an element above to view its details.
Elements A–Z / atomic-number list
| Atomic no. | Symbol | Element | Approx. atomic weight |
|---|
Weights: Unbracketed values are rounded reference atomic weights. Bracketed numbers are representative isotope mass numbers for elements without a standard atomic weight; they are not average atomic weights. Exact official standard values can be intervals and are periodically updated. See IUPAC for research-grade data.