questions 16-19 for hw 2

QUESTION 16 Which of the following is the smallest particle found in matter? Atoms O Molecules Compounds Crystals QUESTION 17 Which of the following represents an element? O SO2 O H202 CO2 O Br2 QUESTION 18 Which of the following contains different types of atoms? An iron nail O A sample of oxygen gas A piece of copper wire Sugar QUESTION 19 Based on periodic trends, a potassium atom should have a higher ionization than a bromine atom. O True