1. Bellwork9.12.2011 1.Draw a picture of an atom. Label the nucleus, protons, neutrons, and electrons. 2.Give the charges of each of the 3 subatomic particles. 3.Using the periodic table (or your knowledge), list 2 elements and describe their use to us!

2. Subatomic Particles ParticleSymbol Charge Relative Mass Electron e - 1- 0 Proton p + + 1 Neutron n0 1

3. Atomic Number Counts the number of protons in an atom

4. Atomic Number on the Periodic Table 11 Na Atomic Number Symbol

5. All atoms of an element have the same number of protons 11 Na 11 protons Sodium

6. Learning Check State the number of protons for atoms of each of the following: A. Nitrogen (N) 1) 5 protons 2) 7 protons 3) 14 protons B. Sulfur (S) 1) 32 protons 2) 16 protons 3) 6 protons C. Barium (Ba) 1) 137 protons 2) 81 protons 3) 56 protons

8. Mass Number Counts the number of protons AND neutrons in an atom We can find this, and the atomic number, in something called...

9. Atomic Symbol Shows the mass number and atomic number Na

10. How to find the # of Neutrons The difference between the mass number and the atomic number. mass number – atomic number = # of Neutrons

11. How to find the # of Electrons An atom is neutral So the net charge is zero Number of protons = Number of electrons Atomic number = Number of electrons!

12. Subatomic Particles in Some Atoms 163165 O P Zn 81530 e- p+ n

15. Isotopes Atoms with the same number of protons, but different numbers of neutrons. In other words... atoms of the same element (same atomic number) with different mass numbers

16. Isotopes of Carbon Isotopes of Helium

17. Learning Check Naturally occurring carbon consists of three isotopes, 12 C, 13 C, and 14 C. 12 C 13 C 14 C 6 6 6 #p _______ _______ _______ #n _______ _______ _______ #e _______ _______ _______

18. Learning Check An atom of zinc (Zn) has a mass number of 65. A.Number of protons in the zinc atom 1) 302) 353) 65 B.Number of neutrons in the zinc atom 1) 302) 353) 65 C. What is the mass number of a zinc isotope with 37 neutrons? 1) 372) 653) 67

20. Learning Check Write the atomic symbols for atoms with the following: A. 8 p +, 8 n, 8 e - ___________ B.17p +, 20n, 17e - ___________

22. Atomic Mass on the Periodic Table 11 Na 22.99 Atomic Number Symbol Atomic Mass

23. Atomic mass is the weighted average mass of all the isotopes of that atom. 11 Na 22.99

24. Example of an Average Atomic Mass Cl-35 is about 75.5 % and Cl-37 about 24.5% of natural chlorine.

25. Bell Work9/13/2011 1. What is the atomic number? 2. What is the mass number? 3. Complete the following and give there element names: 14 C 44 Ca 80 Se 6 20 34 #p _______ _______ _______ #n _______ _______ _______ #e _______ _______ _______

26. The Periodic Table An arrangement of elements in which the elements are separated into groups based on properties.

27. Atomic Number The elements are listed by increasing atomic number ATOMIC # Increases

28. Each horizontal row, there are seven Period

29. Each vertical column Elements that share the same group have similar chemical and physical properties. Group

30. If you didn’t finish these during class do the following for homework: p. 111 #15 and 16 p. 112 #17 and 18 p. 113 #19 and 20 p. 116 #21 and 22 p. 117 #23 and 24 Homework (maybe?)