Electron arrangement Quiz
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5 questions, one answer each
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1. What is the electron arrangement of magnesium (atomic number 12)?
- A. 2,8,2
- B. 2,10
- C. 2,2,8
- D. 12
2. An element has the electron arrangement 2,8,5. Which group is it in?
- A. Group 2
- B. Group 3
- C. Group 5
- D. Group 8
3. An element has the electron arrangement 2,8,8,1. Which period is it in?
- A. Period 1
- B. Period 3
- C. Period 4
- D. Period 19
4. How many valence electrons does fluorine (2,7) have?
- A. 2
- B. 7
- C. 9
- D. 8
5. Why are lithium and sodium in the same group?
- A. They have the same number of shells
- B. They have the same number of outer electrons
- C. They have the same atomic number
- D. They have the same mass