On the Folder tab, in the Properties group, click Folder Properties. On the Outlook Address Book tab, clear the Show this folder as an e-mail Address Book check box. If you want to turn Suggested Contacts off, do the following: Click the File tab.
Best Answer: U-238 is by far the most common isotope of Uranium found naturally, 99.284%. It has 238 nucleons, 92 of which are protons. The remaining 146 are neutrons. U-235, which accounts for 0.711% of all Uranium found naturally, is the useful one for fission reactors (and bombs), has 235 - 92 = 143 neutrons. U-234 is also found in extremely small quantities, 0.0058%, and has 142 neutrons.
Uranium (atomic number 92) is the heaviest element stable enough to be found in nature. The new elements discovered recently were much heavier and unstable (numbers 115, 117, 118âthe heaviest to date), which means they exist for only the smallest fraction of a second before breaking down into smaller parts. Typically, her experiments produce maybe 1 to 3 highly-unstable new atoms, if they are successful.