Explain Why Mendeleev Left Gaps in His Periodic Table of the Elements

Q5: Which set of compounds illustrates the Law

Q6: Which of the following changes is NOT

Q7: Which of the following was NOT explained

Q8: Recycling of hazardous materials is important.

Q9: Which philosopher believed that matter was continuous

Q11: Distinguish between a compound and a mixture.

Q12: The Greek word atomos means<br>A)atom.<br>B)uncuttable.<br>C)invisible.<br>D)continuous.

Q13: Is it always possible to recycle and

Q14: John Dalton discovered which of the following

Q15: The atomic masses for elements are<br>A)actual masses