Calculadora de Átomo

The Atom Calculator determines the number of protons, neutrons, and electrons in an atom based on the mass number (A) and atomic number (Z). In a neutral atom, the number of protons equals the number of electrons, both given by Z. The number of neutrons is calculated as A minus Z. This tool is helpful for chemistry students who need to quickly verify atomic composition, especially in periodic table exercises or atomic model problems.

It works simply: enter the values of A and Z, and the calculator applies the basic atomic structure formulas. Protons (p) = Z; neutrons (n) = A − Z; electrons (e) = Z (for neutral atom). Note that for ions, the electron count differs from Z, but this calculator only considers neutral atoms.

Use this calculator when studying isotopes, electron configuration, or to check answers in general chemistry problems. For example, calculating neutrons for carbon-12 (A=12, Z=6) gives 6 neutrons. It also helps understand the relationship between atomic mass and atomic number.

Caution: the mass number (A) must be a positive integer, usually the sum of protons and neutrons. For elements with isotopes, use the mass number of the specific isotope. Do not confuse atomic number (Z) with atomic mass (which is a weighted average).