4. Which letter represents the protons?

5. Which letter represents the neutrons?

6. Which letter represents the electrons?

7. Which letter represents the nucleus?

8. What is the name of the element represented by this model?

9. The identity of an element is determined by what?

10. What is the charge of an electron?

11. What is the charge of an electron?
negative

12. What is the charge of an proton?

13. What is the charge of an proton?
positive

14. What is the charge of an neutron?

15. What is the charge of an neutron?
Neutral
What does neutral mean?

16. The identity of an element is determined by what?

17. The number of protons.
The identity of an element is determined by what?

18. What element is this?

20. What element is this? Boron

21. What element is this?

22. What element is this? Carbon

24. Calcium

26. chlorine

27. Silicon

30. Metals

32. Nonmetal

33. Metalloid

39. Valence electrons are important because they determine…
The state of matter
Chemical properties
Reactivity
Both b and c

48. Hydrogen, Lithium and Sodium are all in group #___ …

49. Hydrogen, Lithium and Sodium are all in group #_1_ …

50. Potassium, Scandium and Calcium are all in period #___

51. Potassium, Scandium and Calcium are all in period #_4_

54. What do the elements in period 2 all have in common?

55. What do the elements in period 2 all have in common?
They have 2 energy levels

56. What do the elements in group 18 have in common?

57. What do the elements in group 18 have in common?
Their valence energy levels are full.
This keeps them from reacting with other elements.
They are the Noble Gases.

58. What do the elements in group 1 have in common?

59. What do the elements in group 1 have in common?
They have only 1 valence electron.
They are SUPER-chemically reactive

62. The model above is best represented by:
H2O
2OH
HOOH
H2O2

63. The above model shows:
10 atoms
2 molecules
2CH3Cl
All of the above

69. Write the formula…

72. What are the reactants?

73. What are the products?

75. Is it balanced?

76. Matter can’t be created or destroyed is the…

77. Matter can’t be created or destroyed is the…
Law of Conservation of Mass

78. In a chemical reaction new substances with different ___ are formed.
Mass
State of matter
Charges
properties

79. Is it balanced?

80. Is it balanced?

81. Is it balanced?