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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 ... 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.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.

www.thoughtco.com/why-is-the-periodic-table-important-608829

Feb 12, 2017 ... The periodic table organizes elements with similar properties so you can tell the ... The periodic table is one way to organize the elements.

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

Aug 28, 2017 ... The periodic table of elements arranges all of the known chemical elements in an informative array. Elements are arranged from left to right and ...

edtech2.boisestate.edu/lindabennett1/502/periodic%20table%20e%20config/ptable_organized.html

How is the Modern Periodic Table Organized? The common modern periodic table is organized by atomic number (thanks, Mosley!). From there we classify ...

www.bbc.co.uk/bitesize/standard/chemistry/elementsandreactions/periodic/revision/1

A BBC Bitesize secondary school revision resource for Standard Grade Chemistry on the periodic table: how elements are arranged, groups of elements.