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.
Carbon-12 is the most common isotope of carbon. Carbon-14 is radioactive and very rare. Carbon-14; 8 neutrons Carbon-13; 7 neutrons Carbon-12; 6 neutrons The symbols for the isotopes of carbon atoms shown here indicate they each have six protons but mass numbers of 14, 13 and 12. These isotopes are not equally abundant.Carbon-12 (C-12) makes up 98.9 % of all carbon atoms while carbon-13 (C-13) makes up 1.1 %.n example of this is shown with the three different isotopes of carbon. Here they all have 6 protons, but different numbers of neutrons. Carbon-14 has 8 neutrons. Carbon-13 has 7 neutrons and carbon-12 has 6 neutrons.