Einsteinium
Poster
Name of Element and Symbol: Einsteinium-Es
Atomic Number: 99
Mass Number: [252]
Melting Point: 860 degrees Celsius
Boiling Point: ?
Normal Phase: Solid
Element Family: Actinoid
Name of Discover/Date of Discovery:
Albert Ghiorso / December 1952
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Your poster didn't hyperlink. I think that you forgot to insert the link in the pop-up box (it says that it can't find "http"--try to link again.
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