Atoms and the Periodic Table Review Answers. 1.Complete the chart showing the basic info about the atom: 2.What does the atomic number tell you? -number.

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Presentation transcript:

Atoms and the Periodic Table Review Answers

1.Complete the chart showing the basic info about the atom: 2.What does the atomic number tell you? -number of protons 3. The number of protons determines the type (identify) of the element. 4. Why are atoms neutral (have no charge)? -same number of Protons and electrons ParticleChargeMassLocation Proton+1Nucleus Neutron01Nucleus Electron-0Electron cloud (energy levels

5. What are different forms of the same element called? -isotopes 6. Isotopes have the same number of protons but different numbers of neutrons. 7. Which of the following pairs are isotopes of the same element? b. Atom c (20P and 40N) and Atom d (20P and 41N) c. Atom e (56 P and 81N) and Atom f (56 P and 82N) 8. Why are atomic masses written as averages? -mass of all the isotopes found in nature 9. An atom has 8p, 8n, and 8e. What element is it? -oxygen (because oxygen has an atomic number of 8)

10. An atom has 79p, 118n, and 79e. What element is it? -gold (because gold’s atomic number is 79) 11. What is a characteristic of an unstable isotope? -radioactive 12. What are the rows of the periodic table called? -periods 13. What are the columns of the periodic table called? -groups, families 14. What happens to the number of valence electrons as you move across the periodic table? -increase 15. What happens to the number of energy levels as you moved down the periodic table? -increase

16. Why do elements in the same group have similar properties? -same number of valence electrons 17. Elements in the same period have the same number of energy levels. 18. Elements in the same group have the same number of valence electrons. 19. Where are the metals located on the periodic table? -left of the zig zag line 20. Where are the nonmetals located on the periodic table? -right of the zig zag line 21. Where are the metalloids located on the periodic table? -on the zig zag line

22. Which element has the same number of valence electrons as sulfur (S)? -oxygen 23. How are sodium and magnesium atoms similar? -same number of energy levels 24. Which elements are in the same period? -chlorine and phosphorus 25. What do Na, Mg, K, Ca, Cr, Au, and Li have in common? -they are all metals 26. Which element has one more proton than gold (atomic number 79)? -mercury 27. How many valence electrons does Barium have? -2-2

28. How many valence electrons does Bromine have? Name one nonmetal. -bromine 30. Which element is in period 4 and has 5 valence electrons? -arsenic 31. Which element is in period 4 and has 8 valence electrons? -krypton 32. Which element is in period 3 and has 2 valence electrons? -magnesium 33. Which element has one more proton than carbon? -nitrogen

34. Which of the following has 4 energy levels? -Se 35. Which of the following has 4 valence electrons? -Si 36. Which pair of elements has the same number of energy levels? -sodium and magnesium 37. Which describes an element with an atomic number of 20? -20 protons 38. An element with an atomic number of 35 and a mass number of 80 has how many neutrons? What is the mass number of an atom with 19p, 20n, and 19e? -39

40. How many protons are in an atom of silicon? How many electrons are in an atom of Argon? A neutral atom of aluminum has how many electrons? -13

Other information: Group 1 elements are called Alkali Metals Group 2 elements are called Alkaline Earth Metals Group 17 elements are called Halogens Group 18 elements are called Noble Gases You should study the STUDY GUIDE, NOTES, QUIZZES, and BELL RINGERS