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

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 ...

This symbol shows that chlorine has 35 particles ... The relative charge of a nucleus is the same as its proton (atomic) number. Key fact: isotopes are forms of an element that have the same ...