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.
When Uranium, atomic number 92, loses a proton, it is no longer uranium. It is Protactinium, atomic number 91. When it loses another proton, it becomes thorium, Atomic number 90. As the big, unstable atoms decay into smaller atoms, they shoot off high speed particles of various kinds, plus radioactive energy. The process of decay proceeds step by step at a definite rate. After 4.5 billion years, half a supply of radioactive uranium has decayed into a type of lead, whose atomic number is 82.