Our periodic table element lookup is a fast, no-fuss reference for checking a chemical element’s key facts — no need to scroll a giant wall chart looking for one box.
Three ways to search
Type a full element name (“Oxygen”), a chemical symbol (“O”), or an atomic number (“8”) — the lookup matches any of the three instantly, and partial matches work too, so typing “gold” or even “au” will find Gold without needing exact spelling.
What you get
Each result shows the element’s symbol, full name, atomic number, atomic mass, and category (like Alkali Metal, Noble Gas, Halogen, or Transition Metal) — the core facts you’d look up a periodic table for in the first place.
Why atomic mass isn’t a whole number
Atomic mass (or atomic weight) is the weighted average mass of an element’s naturally occurring isotopes, measured in atomic mass units. That’s why values like Chlorine’s 35.45 aren’t round numbers — they reflect a real-world mix of isotopes (like Chlorine-35 and Chlorine-37) found in nature, not a single “pure” atom’s mass.
What element categories tell you
Groupings like “Alkali Metal” or “Halogen” aren’t arbitrary labels — they group elements by shared chemical behavior and position in the periodic table. Elements in the same category tend to show similar reactivity patterns and bonding tendencies, which is the entire organizing logic behind how the periodic table is laid out.