Directions: Read the following statements or questions carefully. Write the letter of the correct answer on a separate sheet. 1. What does the number 6 have to do with the element carbon? A Atomic number C. Mass number B. Valence D. Number of physical forms 2. Which of these is a naturally occurring radioactive isotope of carbon? A Carbon-11 C. Carbon-12 B. Carbon-14 D. Carbon-13 3. Carbon has several physical forms called allotropes. Which of these substances is NOT an allotrope of carbon? A Diamond C. Graphite B. Amorphous carbon D. Quartz 4. Carbon is generally considered a non-metal. Which important metallic property is demonstrated by graphite? A Conducting electricity C. Low melting point B. Malleability D. Transparency 5. What does the number 4 have to do with how carbon forms compounds? A Carbon can form four different ions B. Carbon can form four covalent bonds C. Carbon atoms are always joined to four other atoms D. Carbon atoms can only form quadruple bonds
