1. Henry Mosely

2. What are the three sub- atomic particles of the atom? 3. How do you call the positively charged particles? 4. How do you call the negatively charged particles? 5. The particles that were last to be discovered because it is uncharged. 6. LETS ENTER THE INVISIBLE WORLD !! 7. How do we determine the number of protons, neutron and electrons? 8. The Helium Atom 9. CHEMQUESTStructure of the Atom 10. Information: Structure of the Atom Note the following symbols: (they are not to scale) = proton (positive charge) = electron (negative charge) = neutron (no charge) 11. The following three diagrams are hydrogen atoms: 1 1H 1 2H 1 3H 12. The following three diagrams are carbon atoms: 12 6C 13 6C 14 6C 6 protons,6 neutrons 6 protons,7 neutrons 6 protons,8 neutrons 13. Notice the type of notation used for atoms: Z A X x= CHEMICAL SYMBOL OF ELEMENT Z= ATOMIC NUMBER A= MASS NUMBER 14. 6 12C, 6 13C , 6 14 C are notations that represents isotopes of carbon. 1 1 H , 1 2H , 1 3 H are notation that represents isotopes of hydrogen. 15. 1.How many protons are there in the following: 1 1 H?, 1 2 H?, 1 3 H? CRITICAL THINKING QUESTIONS: 1 proton for 1 1 H 1 proton for 1 2 H 1 proton for 1 3 H 16. 2.How many neutrons are found in each of the following: 1 1 H, 1 2 H, 1 3 H? 0 neutron for 1 1 H 1 neutrons for 1 2 H 2 neutrons for 1 3 H CRITICAL THINKING QUESTIONS: 17. 3.How many electrons are found in each of the following: 1 1 H?,1 1 H?,1 1 H? 1 electron for 1 1H 1 electron for 1 2H 1 electron for 1 3H CRITICAL THINKING QUESTIONS 18. 4.What structural characteristics do all hydrogen atoms have in common? They have the same atomic number CRITICAL THINKING QUESTIONS 19. 5. What structural characteristics do all carbon atoms have in common? They have the same atomic number CRITICAL THINKING QUESTIONS 20. 6. What does the mass number tell you? It tells the number of protons and neutrons in an atom Can you find it on the periodic table Yes, it is only express in atomic mass CRITICAL THINKING QUESTIONS 21. 7.What doe the atomic number tell you? Yes. It tells the number of protons in an atom. Can you find it in the periodic table? CRITICAL THINKING QUESTIONS 22. 8. Define the term isotope. Isotopes is an atom having the same atomic number but differ in mass number. CRITICAL THINKING QUESTIONS 23. 9. How does one isotope of carbon differ from another isotope of carbon? One isotope of carbon is differ in the number of neutrons from the other isotope of carbon. CRITICAL THINKING QUESTIONS 24. IsotopesThe atoms of an element having the same atomic number but different mass number due to difference in the number of neutrons 25. Mass Number It refers to the sum of the numbers of protons and neutrons in an atom 26. Atomic Number It is a unique number of each element that corresponds to the number of protons 27. SKILL PRACTICE 30 65Zn ?Protons ? Electrons ? neutrons Answer a. 30 b. 3o c. 35 28. 1. An atom has a mass number of 43 and it also has 21 as atomic number. a) How many protons does this atom have? b) How many electrons does this atom have? c) How many neutrons does this atom have? SKILL PRACTICE 29. Answer a. 21 b. 21 c. 22 30. SYMBOL # OF PROTONS # OF ELECTRONS # OF NEUTRONS ATOMIC NUMBER MASS NUMBER 1. 13 27 Al 2. 35 80Br QUIZ 31. SYMBOL # OF PROTONS # OF ELECTRONS # OF NEUTRONS ATOMIC NUMBER MASS NUMBER 1. 13 27 Al 13 13 14 13 27 2. 35 80Br QUIZ 32. SYMBOL # OF PROTONS # OF ELECTRONS # OF NEUTRONS ATOMIC NUMBER MASS NUMBER 1. 13 27 Al 13 13 14 13 27 2. 35 80Br 35 35 45 35 80 QUIZ 33. SEE YOU