Isotope table (complete) - AbsoluteAstronomy.com

The various tables below (scroll down) show the known isotope

Isotope

Isotopes are variants of atoms of a particular chemical element, which have differing numbers of neutrons. Atoms of a particular element by definition must contain the same number of protons but may have a distinct number of neutrons which differs from atom to atom, without changing the designation...

s of the chemical element

Chemical element

A chemical element is a pure chemical substance consisting of one type of atom distinguished by its atomic number, which is the number of protons in its nucleus. Familiar examples of elements include carbon, oxygen, aluminum, iron, copper, gold, mercury, and lead.As of November 2011, 118 elements...

s. They are arranged with increasing atomic number

Atomic number

In chemistry and physics, the atomic number is the number of protons found in the nucleus of an atom and therefore identical to the charge number of the nucleus. It is conventionally represented by the symbol Z. The atomic number uniquely identifies a chemical element...

s (proton

Proton

The proton is a subatomic particle with the symbol or and a positive electric charge of 1 elementary charge. One or more protons are present in the nucleus of each atom, along with neutrons. The number of protons in each atom is its atomic number....

numbers) from left to right and increasing neutron

Neutron

The neutron is a subatomic hadron particle which has the symbol or , no net electric charge and a mass slightly larger than that of a proton. With the exception of hydrogen, nuclei of atoms consist of protons and neutrons, which are therefore collectively referred to as nucleons. The number of...

numbers from top to bottom.

For convenience, two different views of the data are available here: “Segmented tables,” and a single “Unitized table (all elements).” Choose whichever one you need from the table of contents, below. The unitized table allows easy visualizion of proton/neutron-count trends but requires simultaneous horizontal and vertical scrolling. The segmented tables permit easier examination of a particular chemical element with much less scrolling. Links are provided to quickly jump between the different sections.

Note the example color legend shown at right. Legends similar to this are provided alongside each table below. Cell color denotes the half-life

Half-life

Half-life, abbreviated t½, is the period of time it takes for the amount of a substance undergoing decay to decrease by half. The name was originally used to describe a characteristic of unstable atoms , but it may apply to any quantity which follows a set-rate decay.The original term, dating to...

of each isotope. If you’ve scrolled so a color legend is not in view, allowing your cursor to dwell over a cell will cause a pop-up text box to indicate that isotope’s half-life.

Cells with colored borders (note the three bottom cells in the color legend at right) denote the half-life of the most stable nuclear isomer

Nuclear isomer

A nuclear isomer is a metastable state of an atomic nucleus caused by the excitation of one or more of its nucleons . "Metastable" refers to the fact that these excited states have half-lives more than 100 to 1000 times the half-lives of the other possible excited nuclear states...

state. The color of the border and the associated half-life of the isomer follow the same convention used for isotope half-lives (white, pink, yellow…). In most cases, a cell’s border is different from that of the cell itself. In some cases however—as with the ¹⁹⁸Au cell shown here—a cell and its border are the same color so the border’s presence is denoted with a dotted margin. If a cell has a colored border, information on the isomer’s half-life is included in the pop-up text box when your cursor dwells over the cell.

To learn more about nuclide

Nuclide

A nuclide is an atomic species characterized by the specific constitution of its nucleus, i.e., by its number of protons Z, its number of neutrons N, and its nuclear energy state....

s and to obtain a quick tutorial on the distinction between isotope

Isotope

s, isotone

Isotone

Two nuclides are isotones if they have the same neutron number N, but different proton number Z. For example, boron-12 and carbon-13 nuclei both contain 7 neutrons, and so are isotones. Similarly, S-36, Cl-37, Ar-38, K-39, and Ca-40 nuclei are all isotones of 20 because they all contain 20 neutrons...

s, and isobars, see Table of nuclides
Table of nuclides
The tables listed below provide information on the basic properties of all nuclides.* Neutron + Element 1 - Element 24 * Element 25 - Element 48 * Element 49 - Element 72...

.