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Californium is a featured article; it (or a previous version of it) has been identified as one of the best articles produced by the Wikipedia community. Even so, if you can update or improve it, please do so.

This article appeared on Wikipedia's Main Page as Today's featured article on July 21, 2011.

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Date	Process	Result
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April 9, 2011	Good article nominee	Listed
July 4, 2011	Featured article candidate	Promoted
September 29, 2014	Good topic candidate	Promoted
February 15, 2024	Good topic removal candidate	Demoted
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Metal detectors?

If I buy a metal detector, will I be able to obtain the Cf out of it? Porygon-Z 04:14, 3 December 2018 (UTC) — Preceding unsigned comment added by Porygon-Z474 (talk • contribs)

No. Keres🌕Luna ^edits! 19:29, 29 April 2022 (UTC)[reply]

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-==Untitled==
-Article changed over to new [[Wikipedia:WikiProject Elements]] format by [[User:Maveric149|mav]] 08:17, 31 Mar 2004 (UTC). Elementbox converted 11:47, 17 July 2005 by [[User:Femto|Femto]] (previous revision was that of [http://en.wikipedia.org/enwiki/w/index.php?title=Californium&oldid=18561824 23:40, 10 July 2005]).  10 July 2005
-== Natural Occurrence ==
-This article states that californium is the heaviest element to occur naturally on Earth.  What is the source for that statement and is it reliable?  Every source I have seen states that plutonium is the last known naturally occurring element on Earth/in the Earth's crust.  <span style="font-size: smaller;" class="autosigned">— Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/72.84.185.135|72.84.185.135]] ([[User talk:72.84.185.135|talk]]) 16:31, 27 October 2012 (UTC)</span><!-- Template:Unsigned IP --> <!--Autosigned by SineBot-->
-:{{cite book|last=Emsley|first=John|title=Nature's Building Blocks: An A-Z Guide to the Elements|edition=New|year=2011|publisher=Oxford University Press|location=New York, NY | isbn = 978-0-19-960563-7 }} [[User:Double sharp|Double sharp]] ([[User talk:Double sharp|talk]]) 02:35, 28 October 2012 (UTC)
-This source is available on Google Books:
-https://books.google.com/books?id=4BAg769RfKoC&pg=PA109&lpg=PA109&dq=natural+californium&source=bl&ots=k13oE1PMtL&sig=aQ7r-ojSQDF7Dv-kc4rfgdeJOVw&hl=en&sa=X&ei=4ckxVcLqEoXSoATdiYCQAQ&ved=0CEsQ6AEwCDgK#v=onepage&q=natural%20californium&f=false
-That is the only source I've ever seen make that claim, and it doesn't cite any outside source nor does it state that any natural californium has ever been detected. It's not implausible that it might occur, but has there ever actually been any detection of it, or any other transplutonium element? If not, should Wikipedia be making this claim? - [[User:Bootstoots|Bootstoots]] ([[User talk:Bootstoots|talk]]) 18:01, 6 May 2015 (UTC)
-I am extremely doubtful of the claim that californium occurs naturally in the Earth's crust. The book says that 5 isotopes exist naturally, including Cf-253, which has a half-life of only 17.8 days. That seems really far-fetched, even with neutron capture. There is only one source, it is a rather non-technical book, and it doesn't cite any sources for its claims. The claim that californium is natural should be removed from Wikipedia, in my opinion, but I am not sure enough to remove it myself.[[User:Fluoborate|Fluoborate]] ([[User talk:Fluoborate|talk]]) 07:32, 15 August 2015 (UTC)
-==Article discussion==
-Excuse me, some questions were discussed on Chinese Wikipedia:
-* "Californium metal starts to vaporize above 300 °C (570 °F) when exposed to a vacuum."
-**'''Anything will be vaporized when exposed to a vacuum, so what's the condition of this discription?'''
-* "melting point of 900 ± 30 °C (1,650 ± 50 °F) and an estimated boiling point of 1,745 K (1,470 °C; 2,680 °F)."....
-**'''Which kind of isotope? The way of estimate?'''
-***<sup>252</sup>Cf. Estimated by extrapolated vapour pressure, probably. [[User:Double sharp|Double sharp]] ([[User talk:Double sharp|talk]]) 11:59, 19 August 2016 (UTC)
-*"Below 51 K (−220 °C) californium metal is either ferromagnetic or ferrimagnetic (it acts like a magnet), between 48 and 66 K it is antiferromagnetic (an intermediate state), and above 160 K (−113 °C; −172 °F)"
-**'''What about 66 K to 160 K? Curie point?'''
-*"A double-hexagonal close-packed form dubbed alpha (α) and a face-centered cubic form designated beta (β).[b] The α form exists below 900 °C (1,650 °F) with a density of 15.10 g/cm3 and the β form exists above 900 °C with a density of 8.74 g/cm3.[15] At 48 GPa of pressure the β form changes into an orthorhombic crystal system due to delocalization of the atom's 5f electrons, which frees them to bond.[16][c]"
-**'''Which kind of isotope? 15.10 possesses four effective digit, what is it's measurement uncertainty? What's the condition of "8.74 g/cm"?---[[User:Koala0090|Koala0090]] ([[User talk:Koala0090|talk]]) 09:57, 8 July 2015 (UTC)
-****If the quoted statement is true, then β-californium is a crystal that exists only above the melting point. How can that be?
-****''' '' Solo Owl '' ''' 04:14, 23 November 2016 (UTC)
-*****The transition temperature is very poorly established, as is very common for elements like this: after all in 1974 two purported Cf allotropes turned out to really be hexagonal Cf<sub>2</sub>O<sub>2</sub>S and fcc CfS. The &alpha;-&beta; transition temperature is probably somewhere around 600–800&nbsp;°C. The melting point is not really known very well either anyway, as it was measured for very small particles, and similarly the crystal structures were determined from microgram quantities of Cf. There is a good reason why knowledge of the detailed chemistry of the actinides is mostly concentrated on the long-lived elements from Th to Pu! (These five and Tc are really the only radioactive elements that have been chemically investigated to a level on par with the stable elements.) [[User:Double sharp|Double sharp]] ([[User talk:Double sharp|talk]]) 04:30, 23 November 2016 (UTC)
-****Thanks for your quick response. I thought it was like that. ''' '' Solo Owl '' ''' 13:49, 23 November 2016 (UTC)
-==Chemistry==
-http://www.osti.gov/scitech/servlets/purl/1225199/ [[User:Double sharp|Double sharp]] ([[User talk:Double sharp|talk]]) 11:59, 19 August 2016 (UTC)
-== External links modified ==
-Hello fellow Wikipedians,
-I have just modified 2 external links on [[Californium]]. Please take a moment to review [https://en.wikipedia.org/enwiki/w/index.php?diff=prev&oldid=779961270 my edit]. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit [[User:Cyberpower678/FaQs#InternetArchiveBot|this simple FaQ]] for additional information. I made the following changes:
-*Added archive https://web.archive.org/web/20110519171204/http://ec.europa.eu/energy/nuclear/transport/doc/irsn_sect03_146.pdf to http://ec.europa.eu/energy/nuclear/transport/doc/irsn_sect03_146.pdf
-*Added archive https://web.archive.org/web/20061026072537/http://www.aip.org/pnu/2006/797.html to http://www.aip.org/pnu/2006/797.html
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-== External links modified ==
-Hello fellow Wikipedians,
-I have just modified one external link on [[Californium]]. Please take a moment to review [https://en.wikipedia.org/enwiki/w/index.php?diff=prev&oldid=781247860 my edit]. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit [[User:Cyberpower678/FaQs#InternetArchiveBot|this simple FaQ]] for additional information. I made the following changes:
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+== Metal detectors? ==
-{{sourcecheck|checked=false|needhelp=}}
+If I buy a metal detector, will I be able to obtain the Cf out of it? Porygon-Z 04:14, 3 December 2018 (UTC)  <!-- Template:Unsigned --><small class="autosigned">—&nbsp;Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[User:Porygon-Z474|Porygon-Z474]] ([[User talk:Porygon-Z474#top|talk]] • [[Special:Contributions/Porygon-Z474|contribs]]) </small> <!--Autosigned by SineBot-->
-Cheers.—[[User:InternetArchiveBot|'''<span style="color:darkgrey;font-family:monospace">InternetArchiveBot</span>''']] <span style="color:green;font-family:Rockwell">([[User talk:InternetArchiveBot|Report bug]])</span> 01:18, 20 May 2017 (UTC)
+:No. [[User:Keresluna|Keres🌕]][[User_talk:Keresluna|Luna]] <sup>[[Special:Contributions/Keresluna|edits!]]</sup> 19:29, 29 April 2022 (UTC)