How many valence electrons are contained in the element \(^{31}_{15}P\)?
-
3
- 4
- 15
- 31
The correct answer is: A
Explanation
The element is Phosphorus in group 5 with valencies of 3 and 5.
The electronic configuration of phosphorus is 2,8,5. Hence it has two valencies of +5 and -3. Since we do not have 5 in the options provided, the valency is 3.
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