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IB Chemistry

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TOPIC 2/12: ATOMIC STRUCTURE

2.1 The nuclear atom

2 Lessons
|
2 Quizzes
1. Atomic structure
  1. Atomic structure QUIZ (paper 1)
2. Isotopes and relative atomic mass
  1. Isotopes and relative atomic mass QUIZ (paper 2)
2.2 Electronic configuration

3 Lessons
|
3 Quizzes
12.1 Electrons in atoms (HL)

2 Lessons
|
3 Quizzes
1. Energy calculations
  1. Energy calculations QUIZ (paper 2)
2. Trends in ionization energy
  1. Trends in ionization energy QUIZ (paper 1)
  2. Trends in ionization energy QUIZ (paper 2)

Participants 450

Lucio
Birgit
acalojo
Adalberto Lynas
Adam Bohner

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Quiz 2 of 8

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Isotopes and relative atomic mass QUIZ (paper 2)

IB Chemistry 2.1 The nuclear atom Isotopes and relative atomic mass Isotopes and relative atomic mass QUIZ (paper 2)

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Question 1 of 3

1. Question
.
- A sample of iron has the following isotopic composition by mass.
  
  ⁵⁴Fe: 6.4%
  
  ⁵⁶Fe: 88.5%
  
  ⁵⁷Fe: 5.1%
  
  Calculate the relative atomic mass of iron based on these data.
  
  Answer (to three sig figs):
Correct

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Question 2 of 3

2. Question
.
- Naturally occurring silver has two stable isotopes, ¹⁰⁷Ag and ¹⁰⁹Ag. The relative atomic mass of silver is 107.87. Estimate the percentage abundance of ¹⁰⁷Ag.
  
  Answer (to three sig figs): %
Correct

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Question 3 of 3

3. Question
.
- Magnesium has three stable isotopes, Mg-24, Mg-25 and Mg-26. The abundance of Mg-24 is 78.6%. Calculate the abundance of Mg-25 .
  
  Mg-25 abundance (to three sig figs): %
Correct

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