Atomic Number & Element Lookup Tool
Atomic Number & Element Lookup Tool
Search all 118 elements of the periodic table by typing a chemical symbol (like Na), a full element name (like Sodium), or an atomic number (like 11) - this tool looks up a match and returns the element's complete data.
Every element's atomic number equals the exact count of protons in its nucleus, which is what uniquely identifies it — two atoms with the same number of protons are always the same element, no matter how many neutrons or electrons they happen to have. Searching by whichever identifier you already know (symbol, name, or number) is far faster than scanning a printed periodic table chart by eye, and the returned category — Noble Gas, Alkali Metal, Transition Metal, and so on — groups elements that share similar chemical behavior, which is useful context beyond just the raw atomic data.
- Every element has a unique atomic number, which equals the number of protons in its nucleus - this uniquely identifies every element.
- You can search three ways: by symbol, by name, or by atomic number, whichever is most convenient.
- The category (like Noble Gas, Alkali Metal, or Transition Metal) groups elements by shared chemical properties on the periodic table.
How do I find an element's atomic number?
Type the element's symbol or name and this tool returns its atomic number instantly, e.g. searching "Fe" or "Iron" returns atomic number 26.
What is the atomic mass of oxygen?
Oxygen's (O, atomic number 8) atomic mass is about 15.999 g/mol.
Atomic Number & Element Lookup Tool
Search all 118 elements of the periodic table by typing a chemical symbol (like Na), a full element name (like Sodium), or an atomic number (like 11) - this tool looks up a match and returns the element's complete data.
Every element's atomic number equals the exact count of protons in its nucleus, which is what uniquely identifies it — two atoms with the same number of protons are always the same element, no matter how many neutrons or electrons they happen to have. Searching by whichever identifier you already know (symbol, name, or number) is far faster than scanning a printed periodic table chart by eye, and the returned category — Noble Gas, Alkali Metal, Transition Metal, and so on — groups elements that share similar chemical behavior, which is useful context beyond just the raw atomic data.
- Every element has a unique atomic number, which equals the number of protons in its nucleus - this uniquely identifies every element.
- You can search three ways: by symbol, by name, or by atomic number, whichever is most convenient.
- The category (like Noble Gas, Alkali Metal, or Transition Metal) groups elements by shared chemical properties on the periodic table.
How do I find an element's atomic number?
Type the element's symbol or name and this tool returns its atomic number instantly, e.g. searching "Fe" or "Iron" returns atomic number 26.
What is the atomic mass of oxygen?
Oxygen's (O, atomic number 8) atomic mass is about 15.999 g/mol.