Answer:p=82,e=82,n=125.
Explanation:
Let [tex]p[/tex] be the number of protons.
Let [tex]e[/tex] be the number of electrons.
Let [tex]n[/tex] be the number of neutrons.
Atomic number is defined as the number of protons in a atom or ion.
Given,atomic number is [tex]82[/tex].
So,[tex]p=82[/tex]
Since the atom is electrically neutral,number of protons and electrons are equal.
So,[tex]e=p=82[/tex]
The atomic mass is the sum of neutrons and protons.
[tex]n+p=207\\n=207-82\\n=125[/tex]
