Periodic Table
What is Periodic Table?
The periodic table is a tabular arrangement of all known chemical elements, organised by increasing atomic number and grouped by similar electronic structure and chemical properties. Developed independently by Dmitri Mendeleev and Lothar Meyer in 1869, it has 118 confirmed elements arranged in 18 groups (columns) and 7 periods (rows). It is the most important organisational tool in chemistry.
Key Facts
Frequently Asked Questions
The periodic table is a tabular arrangement of all known chemical elements, organised by increasing atomic number and grouped by similar electronic structure and chemical properties. Developed independently by Dmitri Mendeleev and Lothar Meyer in 1869, it has 118 confirmed elements arranged in 18 groups (columns) and 7 periods (rows). It is the most important organisational tool in chemistry.