From the symbol ${}_{15}^{31}\text{P}$, 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. 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. 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.

Phosphorus has electronic configuration of 2, 8, 5

Which period the element Phosphorus belong to?