Get facts about the actinides on the periodic table (actinide series or actinoids), including a list of elements and their properties.| Science Notes and Projects
Metalloids or semimetals are elements containing properties midway between metals and nonmetals. This is a list of the metalloid elements.| Science Notes and Projects
Get uranium facts. Learn about the properties, uses, biological effects, and sources of element atomic number 92.| Science Notes and Projects
Get the atomic number definition. See examples of the atomic number and learn how it differs from mass number.| Science Notes and Projects
Get the compound definition in chemistry. See examples of compounds and learn how they differ from molecules.| Science Notes and Projects