| History |
Developed by Dmitri Mendeleev in 1869. He arranged elements based on their atomic masses and predicted the existence of undiscovered elements. |
| Organization |
Elements are arranged based on their atomic numbers, electron configurations, and properties. |
| Periods |
There are seven periods (rows) in the table, representing different principal energy levels. |
| Groups |
The table has 18 groups (columns), with elements in the same group sharing similar properties. |
| Main Groups |
Elements in groups 1, 2, and 13 to 18 are referred to as main group elements. |
| Transition Metals |
Groups 3 to 12 consist of transition metals, known for their variable oxidation states. |
| Lanthanides |
The first row of the f-block contains the 15 lanthanide elements. |
| Actinides |
The second row of the f-block contains the 15 actinide elements. |
| Periodic Trends |
Various trends exist across the table, such as atomic radius, ionization energy, and electronegativity. |
| Periodic Law |
The chemical and physical properties of elements repeat in a periodic manner based on their atomic numbers. |
| Modern Versions |
Modern versions incorporate atomic numbers and reflect our understanding of atomic structure. |
| International Union of Pure and Applied Chemistry (IUPAC) |
IUPAC is the international organization responsible for the standardization of chemical nomenclature, symbols, and the Periodic Table. |
| Database Management |
Several organizations and databases manage and maintain comprehensive information about the elements, their properties, and the Periodic Table. Examples include the IUPAC, the National Institute of Standards and Technology (NIST), and the Royal Society of Chemistry (RSC). |
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