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
September 22 marks the passing of Frederick Soddy. Soddy was the English chemist who came up with the idea of isotopes. Find out what else occurred today in science history.| 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
Learn what happens if you drink heavy water or deuterium oxide, how it tastes, and whether drinking heavy water is safe or not.| 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