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Copy of CI Skill Check #2.1 (Unit 1 Investigation 2 Experience 1) (7/30/2025)

Last updated 7 months ago

5 questions

Required

2

Required

2

Required

2

Required

2

Required

2

Question 1

1.

The image shows a model for a lithium atom:
How many protons are in this lithium atom?

4

10

7

3

Question 2

2.

How many electrons does one neutrally charged atom of neon have?

20

10

20.18

11

Question 3

3.

How many neutrons are there in 225Ra?

314

225

137

88

Question 4

4.

The table shows the number of each of the three subatomic particles for four atoms.
Which atoms represent the same element?

1 and 2

2 and 4

2 and 3

1 and 3

Question 5

5.

Based on the image of abundance of Neon isotopes. What would be a good estimate of the average atomic mass of neon?

19.1 amu

21.0 amu

22.0 amu

20.2 amu