150th Anniversary: Periodic Table of Chemical Elements All ordinary matter in the Universe(not including “Dark Matter”) is composed of chemical elements.It was not until 150 years ago today (on 1869 February 17) that alogical classification system was developed for chemical elements:The Periodic Table of Chemical Elements. MORE INFO - CLICK ON IMAGE OR LINK --- LIKE THIS POST? PLEASE SHARE! Link >>> https://spacewatchtower.blogspot.com/2019/02/150th-anniversary-periodic-table-of.html | | | | | | | | | | | 150th Anniversary: Periodic Table of Chemical Elements Periodic Table of Chemical Elements (Image Sources: Wikipedia.org, By Offnfopt - Own work, Pu... | | | gaw Glenn A. Walsh, Informal Science Educator & Communicator, Friends of the Zeiss < http://friendsofthezeiss.org > Electronic Mail - < [log in to unmask] > SpaceWatchtower Blog: < http://spacewatchtower.blogspot.com/ > ========================================================= Important Subscriber Information: The Museum-L FAQ file is located at http://www.finalchapter.com/museum-l-faq/ . You may obtain detailed information about the listserv commands by sending a one line e-mail message to [log in to unmask] . The body of the message should read "help" (without the quotes). If you decide to leave Museum-L, please send a one line e-mail message to [log in to unmask] . The body of the message should read "Signoff Museum-L" (without the quotes).