2. How many electrons in boron-11?
11 5 6 10 None of these
3. Which of these is a mixture?
Uranium Table Salt (NaCl) Iron Steel Water
4. Which of these is not an element?
Uranium Plutonium Iron Gold Brass
5. How many neutrons in carbon-13?
13 0 1 7 6
| about us | contact us
tutorials index | organic
chemistry | practice tests | online
quizzes | reference tools
site copyright (c) 2002 to neopages.com