From the symbol , state :

(i) mass number of phosphorus,

(ii) atomic number of phosphorus, and

(iii) electron configuration of phosphorus.

Q. From the symbol ³¹P₁₅, state:
(i) mass number of phosphorous,
(ii) atomic number of phosphorous, and
(iii) electron configuration of phosphorus.

Q. Atomic number is Phosphorus is 15
Electronic configuration=K L. M
2. 8. 5
To form octet it requires 3 electron .Hence valency should be 3 but why is valency of Phosphorus is 5 as well as 3 .??

Q. An atom of phosphorus has the symbol ${}_{15}^{31}\text{P}$. How many protons, electrons and neutrons are present in an atom of phosphorus?

Q. Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the periodic table. Write the electronic configuration of these two elements. Which of these will be more electronegative? Why?