2. Which of these is a pure substance?
Blood Ocean Brass Wine Table Salt (NaCl)
3. Which of these has a neutral charge?
Protons Neutrons Electrons Quarks None of these
4. Which of these is not an element?
Uranium Plutonium Iron Gold Brass
5. Which of these has 23 protons?
Scandium Titanium Vanadium Chromium None of these
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