Periodic Table Element Lookup
NewSearch the periodic table by element name, symbol, or atomic number to instantly find atomic mass, category, and other key facts.
Type an element name, symbol, or atomic number to look it up.
Frequently Asked Questions
Can I search by atomic number instead of name?
Yes — type any atomic number (like "8" for Oxygen) and the lookup matches it directly, in addition to matching by full element name or chemical symbol, so you can search however you remember the element.
Does the search require an exact match?
No — partial matches work too. Typing "gold" or even "au" will find Gold, and the results list below the main card shows every element whose name or symbol contains your search text, in case you're not sure of the exact spelling.
What does "atomic mass" mean?
Atomic mass (also called atomic weight) is the weighted average mass of an element's naturally occurring isotopes, measured in atomic mass units (u) — it's why values like Chlorine's 35.45 aren't whole numbers, reflecting a mix of isotopes like Chlorine-35 and Chlorine-37 found in nature.
What do the element categories mean?
Categories like "Alkali Metal," "Noble Gas," "Halogen," and "Transition Metal" group elements by shared chemical behavior and position in the periodic table — elements in the same category tend to have similar reactivity patterns and bonding tendencies, which is the whole organizing principle behind the periodic table's layout.