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      <title>Timeline of periodic table  by Ishan Nemlekar</title>
      <link>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx</link>
      <description>About the times when elements of the periodic table were discovered.</description>
      <language>en-us</language>
      <pubDate>2021-03-19 04:49:51 UTC</pubDate>
      <lastBuildDate>2025-10-15 09:21:48 UTC</lastBuildDate>
      <webMaster>hello@padlet.com</webMaster>
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      <item>
         <title>1649- Arsenic</title>
         <author>ishannemlekar1</author>
         <link>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328611740</link>
         <description><![CDATA[<div>It was used as an ingredient for medicines in Victorian times, but now we know that is is poisonous. </div>]]></description>
         <enclosure url="http://www.saburchill.com/chemistry/visual/atoms/images/033.jpg" />
         <pubDate>2021-03-19 04:52:10 UTC</pubDate>
         <guid>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328611740</guid>
      </item>
      <item>
         <title>1669- Phosphorus</title>
         <author>ishannemlekar1</author>
         <link>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328613744</link>
         <description><![CDATA[<div>A dangerous element, that glows in the dark and is highly flammable.</div>]]></description>
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         <pubDate>2021-03-19 04:53:28 UTC</pubDate>
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      <item>
         <title>1735- Cobalt</title>
         <author>ishannemlekar1</author>
         <link>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328617362</link>
         <description><![CDATA[<div>The name comes from the german word "Kobald" which means goblin.</div>]]></description>
         <enclosure url="https://www.cobaltsign.com/wp-content/uploads/2011/12/cobalt.png" />
         <pubDate>2021-03-19 04:55:43 UTC</pubDate>
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      <item>
         <title>1766- Hydrogen</title>
         <author>ishannemlekar1</author>
         <link>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328620406</link>
         <description><![CDATA[<div>Hydrogen was used in airships and is an explosive gas.</div>]]></description>
         <enclosure url="https://thechemistryguru.com/wp-content/uploads/2017/11/hydrogen-symbol.jpg" />
         <pubDate>2021-03-19 04:57:40 UTC</pubDate>
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      <item>
         <title>1774- Chlorine</title>
         <author>ishannemlekar1</author>
         <link>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328623944</link>
         <description><![CDATA[<div>A green gas which was used a poisonous weapon in WWI</div>]]></description>
         <enclosure url="http://teamchlorine.com/images/chlorine-periodic-table.png" />
         <pubDate>2021-03-19 04:59:48 UTC</pubDate>
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      <item>
         <title>1778- Tungsten</title>
         <author>ishannemlekar1</author>
         <link>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328625801</link>
         <description><![CDATA[<div>The metal with the overall highest melting point (3400 ºC).</div>]]></description>
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         <pubDate>2021-03-19 05:00:59 UTC</pubDate>
         <guid>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328625801</guid>
      </item>
      <item>
         <title>1789- Uranium</title>
         <author>ishannemlekar1</author>
         <link>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328628405</link>
         <description><![CDATA[<div>The metal used for the first atom bomb, dropped in 1945.</div>]]></description>
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         <pubDate>2021-03-19 05:02:31 UTC</pubDate>
         <guid>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328628405</guid>
      </item>
      <item>
         <title>Boron- 1808</title>
         <author>ishannemlekar1</author>
         <link>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328630408</link>
         <description><![CDATA[<div>A material used in Pyrex glass.</div>]]></description>
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         <pubDate>2021-03-19 05:03:49 UTC</pubDate>
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      <item>
         <title>1808- Calcium</title>
         <author>ishannemlekar1</author>
         <link>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328632448</link>
         <description><![CDATA[<div>An important elements for the teeth and bones.</div>]]></description>
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         <pubDate>2021-03-19 05:05:06 UTC</pubDate>
         <guid>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328632448</guid>
      </item>
      <item>
         <title>1826- Bromine</title>
         <author>ishannemlekar1</author>
         <link>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328634486</link>
         <description><![CDATA[<div>A smelly and nasty red liquid, comes for the greek word for "stench".</div>]]></description>
         <enclosure url="http://sciencenotes.org/wp-content/uploads/2015/04/Bromine_Tile.png" />
         <pubDate>2021-03-19 05:06:22 UTC</pubDate>
         <guid>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328634486</guid>
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      <item>
         <title>1828- Aluminium</title>
         <author>ishannemlekar1</author>
         <link>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328636682</link>
         <description><![CDATA[<div>A common element that was expensive in Victorian times.</div>]]></description>
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         <pubDate>2021-03-19 05:07:52 UTC</pubDate>
         <guid>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328636682</guid>
      </item>
      <item>
         <title>1895- Helium</title>
         <author>ishannemlekar1</author>
         <link>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328643006</link>
         <description><![CDATA[<div>An element that was discovered in the Sun. 'Helios' means sun in Greek. <br><br></div>]]></description>
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         <pubDate>2021-03-19 05:12:17 UTC</pubDate>
         <guid>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328643006</guid>
      </item>
      <item>
         <title>1898- Radium</title>
         <author>ishannemlekar1</author>
         <link>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328648242</link>
         <description><![CDATA[<div>It used to be painted on watch dials because it glows in the dark but we now know it can be a cause of cancer. <br><br></div>]]></description>
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         <pubDate>2021-03-19 05:15:24 UTC</pubDate>
         <guid>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328648242</guid>
      </item>
      <item>
         <title>1925- Rhenium</title>
         <author>ishannemlekar1</author>
         <link>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328650675</link>
         <description><![CDATA[<div>A metal with a melting point of over 3000°C. <br><br></div>]]></description>
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         <pubDate>2021-03-19 05:17:05 UTC</pubDate>
         <guid>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328650675</guid>
      </item>
      <item>
         <title>1952- Einsteinium</title>
         <author>ishannemlekar1</author>
         <link>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328652259</link>
         <description><![CDATA[<div>A radioactive element, named after the famous scientist Albert Einstein. <br><br></div>]]></description>
         <enclosure url="http://www.chemistrylearner.com/wp-content/uploads/2018/03/Einsteinium-Symbol.jpg" />
         <pubDate>2021-03-19 05:18:07 UTC</pubDate>
         <guid>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328652259</guid>
      </item>
      <item>
         <title>1970- Hafnium</title>
         <author>ishannemlekar1</author>
         <link>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328653631</link>
         <description><![CDATA[<div>An element produced inside a nuclear reactor. <br><br></div>]]></description>
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         <pubDate>2021-03-19 05:19:05 UTC</pubDate>
         <guid>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328653631</guid>
      </item>
      <item>
         <title>Arsenic</title>
         <author>ishannemlekar1</author>
         <link>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328656929</link>
         <description><![CDATA[]]></description>
         <enclosure url="http://www.dakotamatrix.com/images/products/arsenic31259b.jpg" />
         <pubDate>2021-03-19 05:21:02 UTC</pubDate>
         <guid>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328656929</guid>
      </item>
      <item>
         <title>Phosphorus</title>
         <author>ishannemlekar1</author>
         <link>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328657342</link>
         <description><![CDATA[]]></description>
         <enclosure url="http://www.ecstudents.net/14springb3f/jonufer/images/phosphorus.jpg" />
         <pubDate>2021-03-19 05:21:19 UTC</pubDate>
         <guid>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328657342</guid>
      </item>
      <item>
         <title>Cobalt</title>
         <author>ishannemlekar1</author>
         <link>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328658126</link>
         <description><![CDATA[]]></description>
         <enclosure url="http://4.bp.blogspot.com/-VPBSFPmUeLk/Uo39rwBxVnI/AAAAAAAAAGg/G_7ZHI6ppjQ/s1600/canstockphoto13704550.jpg" />
         <pubDate>2021-03-19 05:21:50 UTC</pubDate>
         <guid>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328658126</guid>
      </item>
      <item>
         <title>Chlorine</title>
         <author>ishannemlekar1</author>
         <link>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328659428</link>
         <description><![CDATA[]]></description>
         <enclosure url="http://www.chemistrylearner.com/wp-content/uploads/2018/08/Chlorine.jpg" />
         <pubDate>2021-03-19 05:22:47 UTC</pubDate>
         <guid>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328659428</guid>
      </item>
      <item>
         <title>Tungsten</title>
         <author>ishannemlekar1</author>
         <link>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328659779</link>
         <description><![CDATA[]]></description>
         <enclosure url="http://www.tungsten.com/wp-content/uploads/2014/02/tungsten-raw.png" />
         <pubDate>2021-03-19 05:23:02 UTC</pubDate>
         <guid>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328659779</guid>
      </item>
      <item>
         <title>Uranium</title>
         <author>ishannemlekar1</author>
         <link>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328660308</link>
         <description><![CDATA[]]></description>
         <enclosure url="http://www.earthtimes.org/newsimage/uranium-mining-power-weapons_20312.jpg" />
         <pubDate>2021-03-19 05:23:23 UTC</pubDate>
         <guid>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328660308</guid>
      </item>
      <item>
         <title>Boron</title>
         <author>ishannemlekar1</author>
         <link>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328660528</link>
         <description><![CDATA[]]></description>
         <enclosure url="https://upload.wikimedia.org/wikipedia/commons/thumb/9/9f/Brown-boron.jpg/1200px-Brown-boron.jpg" />
         <pubDate>2021-03-19 05:23:32 UTC</pubDate>
         <guid>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328660528</guid>
      </item>
      <item>
         <title>Calcium</title>
         <author>ishannemlekar1</author>
         <link>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328660756</link>
         <description><![CDATA[]]></description>
         <enclosure url="https://upload.wikimedia.org/wikipedia/commons/thumb/8/84/Calcium_chloride_CaCl2.jpg/1200px-Calcium_chloride_CaCl2.jpg" />
         <pubDate>2021-03-19 05:23:42 UTC</pubDate>
         <guid>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328660756</guid>
      </item>
      <item>
         <title>Bromine</title>
         <author>ishannemlekar1</author>
         <link>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328661229</link>
         <description><![CDATA[]]></description>
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         <pubDate>2021-03-19 05:23:59 UTC</pubDate>
         <guid>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328661229</guid>
      </item>
      <item>
         <title>Aluminium</title>
         <author>ishannemlekar1</author>
         <link>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328661734</link>
         <description><![CDATA[]]></description>
         <enclosure url="https://upload.wikimedia.org/wikipedia/commons/a/ad/Aluminium_etched.jpg" />
         <pubDate>2021-03-19 05:24:15 UTC</pubDate>
         <guid>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328661734</guid>
      </item>
      <item>
         <title>Helium</title>
         <author>ishannemlekar1</author>
         <link>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328662908</link>
         <description><![CDATA[]]></description>
         <enclosure url="https://images-of-elements.com/helium-2.jpg" />
         <pubDate>2021-03-19 05:25:00 UTC</pubDate>
         <guid>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328662908</guid>
      </item>
      <item>
         <title>Radium</title>
         <author>ishannemlekar1</author>
         <link>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328663475</link>
         <description><![CDATA[]]></description>
         <enclosure url="http://www.pibau.dk/periodisk/periodisk_system/Radium_files/Ra.jpg" />
         <pubDate>2021-03-19 05:25:22 UTC</pubDate>
         <guid>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328663475</guid>
      </item>
      <item>
         <title>Rhenium</title>
         <author>ishannemlekar1</author>
         <link>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328663813</link>
         <description><![CDATA[]]></description>
         <enclosure url="https://onyxmet.com/image/cache/catalog/Beryllium/Rhenium%20telluride-1000x1000.JPG" />
         <pubDate>2021-03-19 05:25:36 UTC</pubDate>
         <guid>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328663813</guid>
      </item>
      <item>
         <title>Einsteinium</title>
         <author>ishannemlekar1</author>
         <link>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328664215</link>
         <description><![CDATA[]]></description>
         <enclosure url="https://i.ytimg.com/vi/7cb66fGjvdw/maxresdefault.jpg" />
         <pubDate>2021-03-19 05:25:51 UTC</pubDate>
         <guid>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328664215</guid>
      </item>
      <item>
         <title>Hafnium</title>
         <author>ishannemlekar1</author>
         <link>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328665959</link>
         <description><![CDATA[]]></description>
         <enclosure url="http://images-of-elements.com/hafnium-3.jpg" />
         <pubDate>2021-03-19 05:27:09 UTC</pubDate>
         <guid>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328665959</guid>
      </item>
      <item>
         <title>Ancient Times- Silver</title>
         <author>ishannemlekar1</author>
         <link>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328666673</link>
         <description><![CDATA[<div>Used in Jewellery for 1000's of years prior.</div>]]></description>
         <enclosure url="http://www.zephyrus.co.uk/silver.gif" />
         <pubDate>2021-03-19 05:27:42 UTC</pubDate>
         <guid>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328666673</guid>
      </item>
      <item>
         <title>Silver</title>
         <author>ishannemlekar1</author>
         <link>https://padlet.com/ishannemlekar1/uepfhv7o4fd2eppx/wish/1328668412</link>
         <description><![CDATA[]]></description>
         <enclosure url="https://www.dakotamatrix.com/images/products/silver46072a.JPG" />
         <pubDate>2021-03-19 05:29:03 UTC</pubDate>
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