Atomic Weight - Definition, List, and Facts
Accurate atomic weight values for all 118 elements with definitions, uses, history, and comparison to atomic mass and mass number.| Science Notes and Projects
Accurate atomic weight values for all 118 elements with definitions, uses, history, and comparison to atomic mass and mass number.| Science Notes and Projects
Get the names and symbols of the first 20 elements of the periodic table. Learn how to use element names to predict facts about the elements.| Science Notes and Projects
Learn about radioactivity. Get the definition and explore the types of radioactive decay. See the nuclear equations for decay.| Science Notes and Projects
Get promethium facts. Discover the history, properties, uses, and sources of the element with symbol Pm and atomic number 61.| Science Notes and Projects
Learn about the Oddo-Harkins rule. Get its definition and learn why the universe prefers elements with even atomic numbers.| Science Notes and Projects
Learn about cosmic rays in physics and cosmology. Get the definition, learn about particle showers, and see whether cosmic rays are dangerous.| Science Notes and Projects
Get the fossil definition, as well as examples and types. Learn how fossils form and where to find them. Get a glossary of key terms.| Science Notes and Projects
Carbon is the sixth element of the periodic table. Get carbon facts, including chemical and physical data, general information, and history.| Science Notes and Projects
List of radioactive elements with no stable isotopes, plus their most stable isotopes, half-lives, key facts, and PDF for printing.| Science Notes and Projects
Learn what mass number means in chemistry and how it differs from atomic number and atomic mass. Get examples of how to find the numbers.| Science Notes and Projects
Learn what nucleons are in chemistry and physics. See how nucleons relate to the mass number and atomic mass of atoms.| Science Notes and Projects
Learn about subatomic particles in physics and chemistry. Discover subatomic particles in an atom and fundamental or elementary particles.| Science Notes and Projects
Get the atomic nucleus definition and facts, including a look at what is inside the nucleus of an atom and how big it is.| Science Notes and Projects
Helium is the second element of the periodic table. These helium facts contain general information, history and chemical and physical data.| Science Notes and Projects
Get the definitions of cations and anions. See examples of the two types of ions, learn how they are different, and see periodic table trends.| Science Notes and Projects
Get bismuth facts. Discover the history, properties, uses, and sources of the element with symbol Bi and atomic number 83.| Science Notes and Projects
Learn what an atom is in science. Get the atom definition, examples, and learn about atomic structure, size, and shape.| Science Notes and Projects
Get the definition of a neutron in chemistry in physics. Learn interesting facts about neutrons and their role within an atom.| Science Notes and Projects
Learn about deuterium. Get facts about what it is, its properties, uses, and sources. See whether it's radioactive.| Science Notes and Projects
Get facts about tritium, the heaviest hydrogen isotope. Learn about its sources, uses, radioactive decay, and natural abundance.| Science Notes and Projects
Get the element definition in chemistry. See examples of chemical elements, learn how many there are, and see how they are identified.| Science Notes and Projects
Learn the difference between and atom and an ion. Get definitions and examples of atoms and ions in chemistry.| Science Notes and Projects
The atom is the unit of matter that identifies a chemical element. Here are 10 interesting atom facts for education and entertainment.| Science Notes and Projects
