1. Chapter 2 Lesson 3 Topics http:\\now.brookscole.com\kotz6e http:\\now.brookscole.com\kotz6e http:\\now.brookscole.com\kotz6e Atomic number, atomic mass & isotopes Atomic number, atomic mass & isotopes Atomic Weight Atomic Weight Atoms and the mole Atoms and the mole The periodic table The periodic table An overview of the elements An overview of the elements

2. Chapter 2 Lesson 3 Density The density of silver is 10.5 g/cm 3. What is the volume of a piece of Ag that contains 2.8 × 10 22 atoms? The density of silver is 10.5 g/cm 3. What is the volume of a piece of Ag that contains 2.8 × 10 22 atoms? a. 0.48 cm 3 a. 0.48 cm 3 b. 53 cm 3 b. 53 cm 3 c. 4.8 × 10 -2 cm 3 c. 4.8 × 10 -2 cm 3 d. 2.1 cm 3 d. 2.1 cm 3

3. Chapter 2 Lesson 3 The atom Which of the following atoms has the greatest number of protons? Which of the following atoms has the greatest number of protons? a. 235 U a. 235 U b. 244 Pu b. 244 Pu c. 239 U c. 239 U d. 243 Am d. 243 Am

4. Chapter 2 Lesson 3 Atomic Weight Chlorine has an average atomic mass of 35.54 u and is known to have only two naturally occurring isotopes. If 75.53% of Cl exists as Cl-35 (34.96885 u), what is the identity and the atomic mass of the other isotope? Chlorine has an average atomic mass of 35.54 u and is known to have only two naturally occurring isotopes. If 75.53% of Cl exists as Cl-35 (34.96885 u), what is the identity and the atomic mass of the other isotope? a. Cl-36; 35.96 u a. Cl-36; 35.96 u b. Cl-36; 36.01 u b. Cl-36; 36.01 u c. Cl-37; 37.30 u c. Cl-37; 37.30 u d. Cl-38; 37.92 u d. Cl-38; 37.92 u

5. Chapter 2 Lesson 3 Atomic Weight An element consists of two isotopes. The abundance of one isotope is 19.78% and its atomic mass is 10.0129 u. The atomic mass of the second isotope is 11.00931 u. What is the average atomic mass of the element? An element consists of two isotopes. The abundance of one isotope is 19.78% and its atomic mass is 10.0129 u. The atomic mass of the second isotope is 11.00931 u. What is the average atomic mass of the element? a. 10.511 u a. 10.511 u b. 10.812 u b. 10.812 u c. 12.011 u c. 12.011 u d. 21.022 u d. 21.022 u

6. Chapter 2 Lesson 3 Atoms and the mole You have 0.500 g of the following elements: He, Ne, Ar, and Kr. Which sample contains the largest number of atoms? You have 0.500 g of the following elements: He, Ne, Ar, and Kr. Which sample contains the largest number of atoms? a. He a. He b. Ne b. Ne c. Ar c. Ar d. Kr d. Kr

7. Chapter 2 Lesson 3 Atoms and the mole What is the mass of 5.8 × 10 18 atoms of Ne? What is the mass of 5.8 × 10 18 atoms of Ne? a. 9.6 × 10 -6 g a. 9.6 × 10 -6 g b. 1.9 × 10 -4 g b. 1.9 × 10 -4 g c. 4.8 × 10 -7 g c. 4.8 × 10 -7 g d. 5.1 × 10 3 g d. 5.1 × 10 3 g

8. Chapter 2 Lesson 3 The periodic table Rows - periods Rows - periods Columns – families/groups Columns – families/groups Main group Main group Transition elements Transition elements