ఆవర్తన పట్టిక: కూర్పుల మధ్య తేడాలు

== Other ==

In celebration of the periodic table's 150th anniversary, the [[United Nations]] declared the year 2019 as the International Year of the Periodic Table, celebrating "one of the most significant achievements in science".<ref name=":1">{{Cite news|url=https://www.bbc.com/news/science-environment-47008289|title=Happy birthday, periodic table|last=Briggs|first=Helen|date=2019-01-29|access-date=2019-02-08|language=en-GB|archive-url=https://web.archive.org/web/20190209210210/https://www.bbc.com/news/science-environment-47008289|archive-date=9 February 2019|url-status=live}}</ref>

 

==Notes==