Search results
Oct 6, 2020 · Learn what atomic number is, how to find it, and why it is important for identifying elements. See the list of atomic numbers and symbols of all 118 elements in the periodic table.
The atomic number or nuclear charge number (symbol Z) of a chemical element is the charge number of an atomic nucleus. For ordinary nuclei composed of protons and neutrons, this is equal to the proton number ( np) or the number of protons found in the nucleus of every atom of that element.
Find the names, symbols and atomic numbers of all 118 elements on the periodic table. Learn how elements are named and how new elements are discovered and approved.
Learn what atomic number is, how it relates to the periodic table of elements, and how it is used in atomic and nuclear physics. Find out the atomic number of iron and see how it is written in symbols.
- The Editors of Encyclopaedia Britannica
Learn how atoms are composed of protons, neutrons, and electrons, and how they define the type and properties of elements. Explore the concept of isotopes, their formation, and their names with examples and questions.
- 10 min
- Jay
Learn about the fundamental properties of atoms, such as atomic number, atomic mass, and isotopes. Find out how radioactive isotopes decay and how they can be used to date fossils.
Find the properties of elements by atomic number on an interactive periodic table. Search for elements by name, symbol, series, block, scale, or configuration and see their atomic mass, energy levels, decay modes, and more.
