Get the answer to how many elements there are on the periodic table and find out how many elements occur naturally.
Chemistry
Learn how many atoms are in the world and how to perform the calculation. Compare this number to the number of way to order playing cards.
How Many Atoms Are in the World? Recently updated !
Learn about group 5 on the periodic table. See which elements belong to this group and learn about their common properties.
Group 5 Periodic Table Elements Recently updated !
Get the Poisson's ratio definition and formula. See a table of common Poisson's ratio values and learn about auxetic materials.
Poisson’s Ratio Recently updated !
Get interesting lead facts including the history, properties, and uses of atomic number 82 with element symbol Pb.
Lead Facts – Pb or Element Number 82
Learn about Abegg's rule in chemistry. See example, exceptions and why the rule is important in the octet rule and chemical bonding.
Abegg’s Rule in Chemistry
Get the coordinate covalent bond definition and examples. Another name for this bond is a dative bond or dipolar bond.
Coordinate Covalent Bond – Dative Bond
Learn about Lewis acid and base theory. See examples of Lewis acids and bases and learn how they differ from Bronsted acids and bases.
Lewis Acid and Base Theory
Learn why rings turn your finger green or black or even red. See which metals cause problems and how to prevent discoloration.