Question detail
Which of the following correctly represents the electronic structure of the first 20 elements?
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. 2,8,8
- B. 2,8,1
- C. 2,8,2
- D. 2,8,0
Answer
2,8,1
Explanation
The electronic structure of sodium, which is one of the first 20 elements, is represented as 2,8,1.
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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