Editing Period (periodic table) (section)

===Period 6===
{{main|Period 6 element}}
{| style="text-align:center;"
|-
! [[Periodic table group|Group]]
! [[Alkali metal|1]]
! [[Alkaline earth metal|2]]
! colspan="14" align="center" | &nbsp;
! [[Group 3 element|3]]
! [[Group 4 element|4]]
! [[Group 5 element|5]]
! [[Group 6 element|6]]
! [[Group 7 element|7]]
! [[Group 8 element|8]]
! [[Group 9 element|9]]
! [[Group 10 element|10]]
! [[Group 11 element|11]]
! [[Group 12 element|12]]
! [[Boron group|13]]
! [[Carbon group|14]]
! [[Pnictogen|15]]
! [[Chalcogen|16]]
! [[Halogen|17]]
! [[Noble gas|18]]
|-
! <small>Atomic #</small><br>Name
| bgcolor="#ff9999" |55<br>[[Caesium|Cs]]
| bgcolor="#ff9999" |56<br>[[Barium|Ba]]
| bgcolor="#9bff99" |57<br>[[Lanthanum|La]]
| bgcolor="#9bff99" |58<br>[[Cerium|Ce]]
| bgcolor="#9bff99" |59<br>[[Praseodymium|Pr]]
| bgcolor="#9bff99" |60<br>[[Neodymium|Nd]]
| bgcolor="#9bff99" |61<br>[[Promethium|Pm]]
| bgcolor="#9bff99" |62<br>[[Samarium|Sm]]
| bgcolor="#9bff99" |63<br>[[Europium|Eu]]
| bgcolor="#9bff99" |64<br>[[Gadolinium|Gd]]
| bgcolor="#9bff99" |65<br>[[Terbium|Tb]]
| bgcolor="#9bff99" |66<br>[[Dysprosium|Dy]]
| bgcolor="#9bff99" |67<br>[[Holmium|Ho]]
| bgcolor="#9bff99" |68<br>[[Erbium|Er]]
| bgcolor="#9bff99" |69<br>[[Thulium|Tm]]
| bgcolor="#9bff99" |70<br>[[Ytterbium|Yb]]
| bgcolor="#99ccff" |71<br>[[Lutetium|Lu]]
| bgcolor="#99ccff" |72<br>[[Hafnium|Hf]]
| bgcolor="#99ccff" |73<br>[[Tantalum|Ta]]
| bgcolor="#99ccff" |74<br>[[Tungsten|W]]
| bgcolor="#99ccff" |75<br>[[Rhenium|Re]]
| bgcolor="#99ccff" |76<br>[[Osmium|Os]]
| bgcolor="#99ccff" |77<br>[[Iridium|Ir]]
| bgcolor="#99ccff" |78<br>[[Platinum|Pt]]
| bgcolor="#99ccff" |79<br>[[Gold|Au]]
| bgcolor="#99ccff" |<span style="color:blue;">80</span><br>[[Mercury (element)|Hg]]
| bgcolor="#fdff8c" |81<br>[[Thallium|Tl]]
| bgcolor="#fdff8c" |82<br>[[Lead|Pb]]
| bgcolor="#fdff8c" |83<br>[[Bismuth|Bi]]
| bgcolor="#fdff8c" |84<br>[[Polonium|Po]]
| bgcolor="#fdff8c" |85<br>[[Astatine|At]]
| bgcolor="#fdff8c" |<span style="color:green;">86</span><br>[[Radon|Rn]]
|}
Period 6 is the first period to include the [[f-block]], with the [[lanthanide]]s (also known as the [[rare earth element]]s), and includes the heaviest stable elements. Many of these [[heavy metals]] are toxic and some are radioactive, but [[platinum]] and [[gold]] are largely inert.