The answer could possibly be D.) The product have more potential than the activated complex OR C.) Forming the activated complex requires energy .
Alkali metals have only one electron in their outermost energy levels , so (they can loose one electron to) they form a mono positive ion only . That's why alkali metal do not from dispositive ions .
Hope that helps:)
Answer:
Cobalt (Co)
Explanation:
3d^7 is the location of Cobalt's last electron.