Answer:
[tex]\boxed {\tt A. \ 2 \ phosphorus \ and \ 5 \ oxygen}[/tex]
Explanation:
We are given the chemical formula:
[tex]\sf P_2O_5[/tex]
The subscript of 2 comes after the P. The element P is phosphorous, so there are 2 phosphorous atoms.
The subscript of 5 comes after the O. The element O is oxygen, so there are also 5 oxygen atoms.
Therefore the correct answer is A. 2 phosphorous and 5 oxygen
