JAMB - Chemistry (2020 - No. 16)
How many valence electrons are contained in the element \(^{31}_{15}P\)?
3
4
15
31
Explicaţie
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.