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Atom Calculator

The atom calculator is a tool for calculating the atomic number and the mass number based on numbers of atom components - protons, neutrons, and electrons (or vice versa).

Atomic composition

What is atom?

Atom is the smallest constituent unit of matter that retains the properties of an element. A typical atom consists of a nucleus and electron cloudAtom components are positively-charged protons and electrically neutral neutrons in the nucleus and negatively-charged electrons orbiting this nucleus. Protons and neutrons are called nucleons.

Atoms are electrically neutral because they possess an equal number of electrons and protons. However, when an atom has an unequal number of protons and electron, it has an electrical charge and they create ions. If an ion has more protons than electrons, it is positively charged and is called a cation. Conversely, if an ion has more electrons than electrons, it is negatively charged and is called an anion.

Some atoms can split into smaller parts (lighter nuclei). If you want to know half lifetime, you can use Half Life Calculator in order to calculate the number of nuclei remaining after a certain time.