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  2. Meitnerium - Wikipedia

    en.wikipedia.org/wiki/Meitnerium

    It is an extremely radioactive synthetic element (an element not found in nature, but can be created in a laboratory). The most stable known isotope, meitnerium-278, has a half-life of 4.5 seconds, although the unconfirmed meitnerium-282 may have a longer half-life of 67 seconds.

  3. File:Lesson Plan Template.pdf - Wikipedia

    en.wikipedia.org/wiki/File:Lesson_Plan_Template.pdf

    You are free: to share – to copy, distribute and transmit the work; to remix – to adapt the work; Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses ...

  4. Group 9 element - Wikipedia

    en.wikipedia.org/wiki/Group_9_element

    Of the group 9 elements, only cobalt has a biological role. It is a key constituent of cobalamin, also known as vitamin B 12, the primary biological reservoir of cobalt as an ultratrace element. [21] [22] Bacteria in the stomachs of ruminant animals convert cobalt salts into vitamin B 12, a compound which can only be produced by bacteria or ...

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  6. Category:Groups (periodic table) - Wikipedia

    en.wikipedia.org/wiki/Category:Groups_(periodic...

    Learn to edit; Community portal; Recent changes; ... Download as PDF; Printable version; ... Group 7 element; Group 8 element; Group 9 element; Group 10 element;

  7. Extended periodic table - Wikipedia

    en.wikipedia.org/wiki/Extended_periodic_table

    Thus element 164 with 7d 10 9s 0 is noted by Fricke et al. to be analogous to palladium with 4d 10 5s 0, and they consider elements 157–172 to have chemical analogies to groups 3–18 (though they are ambivalent on whether elements 165 and 166 are more like group 1 and 2 elements or more like group 11 and 12 elements, respectively). Thus ...

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