Interactive periodic table with up-to-date element property data collected from authoritative sources. Look up chemical element names, symbols, atomic masses and other properties, visualize trends, or …

For elements with no stable isotopes, the mass number of the isotope with the longest half-life is in parentheses.

Like the periodic table, the list below organizes the elements by the number of protons in their atoms; it can also be organized by other properties, such as atomic weight, density, and electronegativity.

Apr 17, 2026 · Periodic table, in chemistry, is an organized array of all the chemical elements in order of increasing atomic number. When the elements are thus arranged, there is a recurring pattern in …

Explore the chemical elements through this periodic table ... The standard form of the periodic table shown here includes periods (shown horizontally) and groups (shown vertically).

There are 118 elements on the periodic table. Here's a list of all of the chemical elements of the periodic table ordered by increasing atomic number.

The periodic table of elements is a concise, information-dense catalog of all of the different sorts of atoms in the universe, and it has a wealth of information to tell us if we can learn to read it.

The periodic table of chemical elements, often called the periodic table, organizes all discovered chemical elements in rows (called periods) and columns (called groups) according to increasing …

The periodic table summarizes various properties of the elements, allowing chemists to derive relationships between them and to make predictions about exceedingly transient nuclides not yet …

Apr 17, 2026 · A chemical element is any substance that cannot be decomposed into simpler substances by ordinary chemical processes. Elements are the fundamental materials of which all …