What is the valency of an element with the electronic configuration 2, 8, 7?
CHEMISTRY
JAMB 2023
What is the valency of an element with the electronic configuration 2, 8, 7?
- A. 7
- B. 1
- C. 2
- D. 3
Correct Answer: B. 1
Explanation
The valency of an element is determined by the number of electrons it gains or loses to achieve a stable electron configuration. For an element with the electronic configuration 2, 8, 7, the outermost shell (valence shell) has 7 electrons. To achieve stability, it needs 1 more electron to fill the outermost shell, so its valency is 1.
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