Question 1
Question detail
An ion has a charge of +2 and an atomic number of 12. How many electrons does it have?
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. 10
- B. 12
- C. 14
- D. 2
Answer
10
Explanation
The ion has an atomic number of 12, indicating 12 protons. With a +2 charge, it has lost 2 electrons: 12 - 2 = 10 electrons.
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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