Question 1
Question detail
What is the mass number of an isotope that has 7 protons and 8 neutrons?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Atomic structure
Question
- A. 15
- B. 7
- C. 8
- D. 14
Answer
15
Explanation
The mass number is the sum of protons and neutrons. For this isotope: mass number = protons + neutrons = 7 + 8 = 15.
Common mistake
Misunderstanding Atomic Structure Development
Students often state that atomic structure has remained unchanged over time, failing to recognize historical developments in atomic theory.
To correct this, students should study the progression of atomic models, from Dalton's solid sphere model to Thomson's plum pudding model, Rutherford's nuclear model, and Bohr's model, noting how each contributed to our current understanding. For example, the formula for atomic structure development can be summarized as: 'Historical models + experimental evidence = current atomic theory'. This shows how scientific understanding evolves with new discoveries.
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