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