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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.
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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 ... 0. Keywords: element, periodic table · Photo: Jenny Eyley ... Electrons are arranged in layers around the protons and neutrons. The number of ...

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 ...

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

The periodic table organizes all known elements by atomic number. Elements are further organized into periods and groups. Trends in chemical characteristics  ...

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 ...

www.quora.com/Why-is-the-Periodic-Table-arranged-by-atomic-number-and-not-atomic-mass

Here is bit more detail. Atomic number is the number of protons, while atomic mass is the ... So atomic mass is not a natural way to order a periodic table, since periodic tables were (and are) principally aimed at capturing the chemical ...

www.thoughtco.com/modern-periodic-table-organization-4032075

Apr 21, 2016 ... The periodic table is one of the most valuable tools for chemists and other scientists because it orders the chemical elements in a useful way.