1. What do you NOT find in a nucleus?
Protons Neutrons Electrons Quarks None of these

2. How many protons in sodium-23?
11 12 23 1 0

3. Which of these can an element have a different number of?
Protons Neutrons Electrons All of these None of these

4. Which of these is a mixture?
Uranium Table Salt (NaCl) Iron Steel Water

5. Which of these is not an element?
Uranium Plutonium Iron Gold Brass


Last 15 Challengers

news | about us | contact us
tutorials index | organic chemistry | practice tests | online quizzes | reference tools
site copyright (c) 2002 to neopages.com