The periodic table is a well-organized chart that contains all the known elements in the universe. These elements are ...

And an element is a pure substance made from ... Water is a compound of hydrogen and oxygen. The symbols H for hydrogen and O for oxygen are used to represent H₂O. Sulfuric acid is a combination ...

These elements are organized in the periodic table based on their atomic numbers, which increase sequentially from 1 (Hydrogen) to 118 (Oganesson). Each element has unique chemical properties and ...