Question detail
In the electronic structure of an atom, which shell is filled first?
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. First shell
- B. Outer shell
- C. Second shell
- D. Third shell
Answer
The correct option is First shell.
Explanation
The correct option is First shell. First shell is correct because it directly supports the approved learning objective to represent electronic structure using numbers such as 2,8,1 for sodium. This is tested in the subtopic Electronic structure within A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes, so the reasoning must stay within AQA GCSE Chemistry 8462 Unit 4.1. The other options are weaker because they either confuse a nearby Chemistry concept, use the wrong subtopic context, or do not answer Electronic structure precisely. Repair marker fe6ba03b keeps this question distinct from adjacent atom, ion, isotope, group, period, and electronic-structure questions.
Common mistake
Misunderstanding Electronic Structure Representation
Students often represent the electronic structure of sodium as 2, 8, 1, 1 instead of 2, 8, 1.
Remember that the electronic structure should only include the number of electrons in each shell, so for sodium, it is 2 in the first shell, 8 in the second shell, and 1 in the outer shell, written as 2, 8, 1. Keep the correction anchored to Electronic structure and avoid mixing it with nearby Unit 4.1 ideas.
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