Question detail
How many electrons are in the outer shell of magnesium?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes
Question
- A. 2
- B. 3
- C. 1
- D. 8
Answer
2
Explanation
Magnesium has an electronic structure of 2,8,2, meaning it has 2 electrons in its outer shell.
Common mistake
Misrepresenting Electron Shells
Students often incorrectly draw the electron shell diagrams for elements, placing too many electrons in the outer shell or not following the 2,8,8 rule for higher energy levels.
Ensure that the first shell holds a maximum of 2 electrons, the second shell holds up to 8, and the third shell also holds up to 8 for the first 20 elements.
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