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.
1 Natural uranium is 99.3 percent U-238 and 0.7 percent U-235. 2  Most nuclear power plants today use enriched uranium in which the concentration of U-235 is increased from 0.7 percent U-235 to (nowadays) about 4 to 5 percent U-235. Natural uranium is 99.3 percent U-238 and 0.7 percent U-235. 2  Most nuclear power plants today use enriched uranium in which the concentration of U-235 is increased from 0.7 percent U-235 to (nowadays) about 4 to 5 percent U-235.