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Overview
Overview
The Periodic Table is the result of hard work by many scientists over hundreds of years. They helped to develop it by discovering, and investigating new elements.
Do you know how the periodic table was formed?
Mendeleev was the first chemist who gave us a proper tabular periodic table. But how did he come up with it?
On what basis did he arrange the elements?
Who were the other chemists who tried doing so before and after him?
The Periodic Table Song
Introduction to the Modern Periodic Table
Introduction to the Modern Periodic Table
The Periodic Table as we know it today is managed by the International Union of Pure and Applied Chemistry, or IUPAC.
Atomic weights have changed as a function of time. Since 1899, the IUPAC Commission on Isotopic Abundances and Atomic Weights (CIAAW) has been evaluating atomic weights and abundances. For example, Carbon had an atomic weight of 12.00 in 1902 but today it is 12.0096, 12.0116.
IUPAC
The modern Periodic Table
About of the Periodic Table
About of the Periodic Table
Periodic Table is a tabular display of the chemical elements, which are arranged by increasing atomic number, electron configuration, and recurring chemical properties.
The seven rows, called PERIODS, generally have metals on the left and non-metals on the right.
The columns, called GROUPS, contain elements with similar chemical behaviors.
Six groups have accepted names as well as assigned numbers:Group 1 : Alkali metals
Group 2 : Alkaline earth metals
Group 15 : Pnictogens
Group 16 : Chalcogens
Group 17 : Halogens
Group 18: : Noble gases
Sub-groups of periodic
The elements of sub-group A : Main elements.
The elements of sub-group B : Transition elements.
When across a period, the properties of elements become less metallic.
The elements of the Periodic Table can be divided into three categories:
for further information about lists of elements and facts about the periodic table, click on the link: https://pubchem.ncbi.nlm.nih.gov/periodic-table/#property=GroupBlock
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