The Periodic Table: 150 Years Old

The periodic table is all over the place. In classrooms, offices, labs or professional medicine.. It has even inspired other versions categorizing desserts, superheroes, and more. People across the world, scientists and science enthusiasts alike, appreciate the table for what it is: an embodiment of the fundamental organizing principles of chemistry, an indelible reminder that the elements can be put in order and maybe even tamed.

The importance of the periodic table to all of science has made it a symbol of pride for chemists. It’s also become chemistry’s most important bridge to the public. People the world over wear novelty T-shirts with messages spelled out in the universal language of element tiles. And the discovery and naming of new elements continues to capture our imagination, despite the fact that we no longer sift through mineral ores to find them, Indiana Jones–style, but more obscurely smash atoms together to create them.

Electron Configuration
In atomic physics and quantum chemistry, the electron configuration is the distribution of electrons of an atom or molecule (or other physical structure) in atomic or molecular orbitals. For example, the electron configuration of the neon atom is 1s2 2s2 2p6, using the notation explained below.

Empirical Formula
A formula giving the proportions of the elements present in a compound but not the actual numbers or arrangement of atoms.

In chemistry, the empirical formula of a chemical compound is the simplest positive integer ratio of atoms present in a compound. 

Diatomic Elements
The diatomic elements are the –ine halogens(fluorinechlorinebromineiodine) and elements with a –gen ending (hydrogenoxygennitrogen).Astatine is another halogen, but its behavior is not known


To mark 150 years of Dmitri Mendeleev’s now-iconic periodic table, the United Nations General Assembly and UN Educational, Scientific, and Cultural Organization have proclaimed 2019 the International Year of the Periodic Table of Chemical Elements.

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