MCAT General Chemistry Question 25: Answer and Explanation
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Question: 25
10. How many valence electrons are present in elements in the third period?
- A. 2
- B. 3
- C. The number decreases as the atomic number increases.
- D. The number increases as the atomic number increases.
Correct Answer: D
Explanation:
This question is simple if one recalls that periods refer to the rows in the Periodic Table, while groups or families refer to the columns. Within the same period, an additional valence electron is added with each step toward the right side of the table.