Question detail
Why do elements in the same group often have similar chemical properties?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
The periodic table
Question
- A. They have the same number of outer-shell electrons
- B. They have the same mass number
- C. They have the same number of neutrons
- D. They are arranged in the same period
Answer
They have the same number of outer-shell electrons
Explanation
The correct option is "They have the same number of outer-shell electrons". Elements in the same group have the same number of electrons in their outer shell. Periods show occupied shells, while mass number and neutron number are not the reason for group similarity.
Common mistake
Outer-shell Electrons Confusion
Students often think that elements in the same group have the same total number of electrons instead of the same number of outer-shell electrons.
Focus on understanding that only the outer-shell electrons determine the group properties, not the total electron count.
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