Unit 1 Section B: Counting Subatomic Particles Worksheet 1. boron

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Unit 1 Section B: Counting Subatomic Particles Worksheet

Using a periodic table, fill in the chart with the correct information. Assume that all atoms are electrically neutral.

Name Symbol Atomic

Number

M ass

Number

# of

Protons

# of

Neutrons

# of

Electrons

1. boron

2. zinc

B 5 11 5 6

31

5

3.

4.

5.

6.

7.

8. fermium

9. cesium

10.

K

U

22

42

42

122

257

97

47

27

146

60

79

11.

12. krypton

13.

14. N

86

120

222

15

78

47

15. 7 7

1. What similarities exist between the answers to questions 14 and 15 on the table?

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55

51

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2. What differences exist between the answers to questions 14 and 15 on the table?

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3. What term can be applied to atoms like those described in questions 14 and 15 on the table?

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4. What is the difference between mass number (used in this exercise) and atomic weight (found on the periodic table)?

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