1. Challenge #1 T. Trimpe 2008 http://sciencespot.net/

2. 5 B Boron 10.81 2 He Helium 4.003 11 Na Sodium 22.990 17 Cl Chlorine 35.453 Use the information provided to answer the questions. 1.What is the atomic number for Chlorine? 2.What is the atomic mass for Boron? 3.How many protons are in an atom of Na? 4.How many neutrons are in an atom of He? 5.How many electrons are in an atom of Cl? 6.How many protons and neutrons would be in an atom of Chlorine? 7.How many neutrons are in an atom of Na? 8.How many protons and neutrons are in an atom of Helium?

3. 5 B Boron 10.81 2 He Helium 4.003 11 Na Sodium 22.990 17 Cl Chlorine 35.453 The answers are … 1.What is the atomic number for Chlorine? 2.What is the atomic mass for Boron? 3.How many protons are in an atom of Na? 4.How many neutrons are in an atom of He? 5.How many electrons are in an atom of Cl? 6.How many protons and neutrons would be in an atom of Chlorine? 7.How many neutrons are in an atom of Na? 8.How many protons and neutrons are in an atom of Helium? 17 10.81 or 11 11 2 17 35.453 or 35 12 4.003 or 4

4. Challenge #2 T. Trimpe 2008 http://sciencespot.net/

5. 3 Li Lithium 6.94 1 H Hydrogen 1.01 14 Si Silicon 28.09 18 Ar Argon 39.95 Use the information provided to answer the questions. 1.What is the atomic number for lithium? 2.How many protons does an atom of Si have? 3.What is the atomic mass for Argon? 4.How many electrons does an atom of H have? 5.How many neutrons are in an atom of Li? 6.How many electrons are in an atom of Si? 7.How many electrons would be in the second energy level of an atom of Si? 8.How many protons and neutrons are in an atom of Argon?

6. 3 Li Lithium 6.94 1 H Hydrogen 1.01 14 Si Silicon 28.09 18 Ar Argon 39.95 The answers are … 1.What is the atomic number for lithium? 2.How many protons does an atom of Si have? 3.What is the atomic mass for Argon? 4.How many electrons does an atom of H have? 5.How many neutrons are in an atom of Li? 6.How many electrons are in an atom of Si? 7.How many electrons would be in the second energy level of an atom of Si? 8.How many protons and neutrons are in an atom of Argon? 3 14 39.95 1 4 14 8 39.95

7. Challenge #3 T. Trimpe 2008 http://sciencespot.net/

8. Fill in the chart using the information provided. ElementAtomic # Atomic Mass ProtonsNeutronsElectrons Li37ABC O8DE8F AlG27HI13 A BC DEF GHI

9. The answers are … ElementAtomic # Atomic Mass ProtonsNeutronsElectrons Li37ABC O8DE8F AlG27HI13 3 43 1688 13 14

10. Challenge #4 T. Trimpe 2008 http://sciencespot.net/

11. Fill in the correct number for each letter using the information provided. Element Atomic Number Atomic Mass # of Protons # of Neutrons # of Electrons Mg1224ABC P15DE16F KG39HI19 A BC DEF GHI

12. The answers are … ElementAtomic # Atomic Mass ProtonsNeutronsElectrons Mg1224ABC P15DE16F KG39HI19 12 3115 19 20

13. Challenge #5 T. Trimpe 2008 http://sciencespot.net/

14. Use a periodic table to help you identify each element. Give its symbol for the answer. 1. I am a member of the Boron family with 49 protons. 2. I have a total of 74 electrons in an atom. 3. I have an atomic mass of 55.847. 4. I have 8 neutrons in an atom. 5. I have 14 protons, 14 neutrons, and 14 electrons in an atom. 6. I have 99 protons and 99 electrons in an atom. 7. I am a member of the Halide family with 18 neutrons. 8. I have 20 neutrons, but only 2 valence electrons.

15. The answers are … 1. I am a member of the Boron family with 49 protons. 2. I have a total of 74 electrons in an atom. 3. I have an atomic mass of 55.847. 4. I have 8 neutrons in an atom. 5. I have 14 protons, 14 neutrons, and 14 electrons in an atom. 6. I have 99 protons and 99 electrons in an atom. 7. I am a member of the Halide family with 18 neutrons. 8. I have 20 neutrons, but only 2 valence electrons. In W Fe O Si Es Cl Ca