Search results
Results from the WOW.Com Content Network
A comprehensive table of 118 chemical elements with their names, symbols, atomic numbers, properties, and origins. The table is organized by the number of protons in each element's atomic nucleus, also known as the periodic table of the elements.
A proton is a stable subatomic particle with a positive charge of +1 e and a mass of 1.672 621 925 95(52) × 10−27 kg. It is composed of two up quarks and one down quark, and its mass is mainly due to the binding energy of the quarks and gluons.
The atomic nucleus is the small, dense region consisting of protons and neutrons at the center of an atom, discovered in 1911 by Ernest Rutherford. Learn about the history, etymology, principles, and models of the nucleus, as well as its role in nuclear physics and chemistry.
An atom is the smallest particle of an element that has the same chemical properties as the element. It consists of a nucleus of protons and neutrons, surrounded by electrons. Learn about the history of atomic theory, the structure and properties of atoms, and how they form compounds.
A table or chart of nuclides is a graph of isotopes of the elements, based on their numbers of neutrons and protons. Isodiaphers are nuclides with the same difference between their numbers of neutrons and protons (N − Z), and they follow diagonal lines at right angles to the isobar lines.
This web page shows the number and stability of isotopes for each element in the periodic table. A stable atom that has a large nucleus most likely contains more neutrons than protons, as the ratio of neutrons to protons affects the stability of the nucleus.
A chemical element is a substance that cannot be broken down by chemical reactions and has a unique atomic number. Learn about the history, properties, and classification of the 118 elements, from hydrogen to oganesson.
Hydrogen (1 H) has three naturally occurring isotopes: 1 H, 2 H, and 3 H. 1 H and 2 H are stable, while 3 H has a half-life of 12.32(2) years. [3] [nb 1] Heavier isotopes also exist; all are synthetic and have a half-life of less than 1 zeptosecond (10 −21 s).