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The Periodic Table of Elements
Dmitri Mendeleev generally is credited with the creation of the first periodic table, which charts the chemical elements by atomic number and valence shell electron configuration.
Browse Elements:

en.wikipedia.org/wiki/Period_(periodic_table)

A period in the periodic table is one of the horizontal rows, all of whose elements have the same number of electron shells. Going across a period, each element has one more proton and is less metallic than its predecessor. Arranged this way, groups of elements in the same column have similar ...

www.wyzant.com/resources/lessons/science/chemistry/periodic-table

The periodic table is a way to organize the elements based on their similarities. The first version was constructed by Dmitri Mendeleev in 1869. He put the ...

diamondj14.imascientist.org.uk/2014/06/18/why-is-the-periodic-table-set-out-the-way-it-is

Jun 18, 2014 ... Electrons are arranged in layers around the protons and neutrons. ... Lots of people suggested alternative versions of the periodic table and ...

sciencing.com/periodic-table-organized-5481908.html

Apr 24, 2017 ... The periodic table organizes all known elements by atomic number. Elements are further organized into periods and groups. Trends in ...

www.livescience.com/25300-periodic-table.html

Jan 5, 2016 ... The Periodic Table of the Elements arranges all of the known elements in an informative array. Elements are arranged in order of increasing ...

dl.clackamas.edu/ch104/lesson6arrangement.html

The elements on the periodic table are arranged so that their atomic numbers ... You may wonder why helium, with atomic number 2, is put way over on the right ...

www.chem4kids.com/files/elem_pertable.html

Elements as Building Blocks. The periodic table is organized like a big grid. Each element is placed in a specific location because of its atomic structure. As with ...

www.tutordelphia.com/blog/why-is-the-periodic-table-shaped-like-a-castle

But it doesn't look anything like any table you've ever seen before. In fact it looks more like a castle than a table. So why is the periodic table shaped the way it is ...

www.infoplease.com/science-health/physical-science/periodic-table

... 1900 there were more than 80—scientists tried to find a way to organize them systematically, ... Today, the periodic table organizes the elements in horizontal rows, ... The elements are also organized in vertical columns, or groups, based on ...