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{{pp-semi-indef|small=yes}}

[[File:Periodic table (metals–metalloids–nonmetals, 32 columns).png|upright=1.36|left|thumb

|{{legend inline|1={{element color|metals}}|2=Metals|border=none}}, {{legend inline|1={{element color|metalloids}}|2=metalloids|border=none}}, {{legend inline|1={{element color|nonmetals}}|2=nonmetals|border=none}}, and {{nowrap|{{legend inline|1={{element color|unknown chemical properties}}|2=elements with unknown chemical properties|border=none}}}} in the periodic table. Sources disagree on the classification of some of these elements.]]

 

===Electron configuration===

 

 

{{main|Atomic radius}}

[[File:Empirical atomic radius trends.png|thumb|upright=1.35|left|Atomic number plotted against atomic radius{{#tag:ref|The noble gases, astatine, francium, and all elements heavier than [[americium]] were left out as there is no data for them.|group=n}}]]

 

 

[[File:First Ionization Energy.svg|thumb|upright=2.27|left|Ionization energy: each period begins at a minimum for the alkali metals, and ends at a maximum for the noble gases]]

 

 

 

{{main|Electronegativity}}

 

 

 

{{multiple image|direction=vertical|align=left|width=147|image1=Medeleeff by repin.jpg|caption1=''Dmitri Mendeleev'', watercolour by [[Ilya Repin]]|image2=D. Mendeleev's Periodic table from his book.JPG|caption2=Mendeleev's periodic table from his book ''An Attempt Towards a Chemical Conception of the Ether''}}

[[File:Mendeleev's 1869 periodic table.svg|upright=1.15|thumb|right|A version of Mendeleev's 1869 periodic table: ''An experiment on a system of elements based on their atomic weights and chemical similarities.'' This early arrangement presents the periods vertically, and the groups horizontally.]]

[[File:Periodic table by Mendeleev, 1871.svg|thumb|left|upright=2.27|Mendeleev's 1871 periodic table with eight groups of elements. Dashes represented elements unknown in 1871.]] [[File:ShortPT20b.png|thumb|left|upright=2.27|Eight-column form of periodic table, updated with all elements discovered to 2016]]

 

 

===The long- or 32-column table===

 

 

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