Answer :
Answer:
[tex]\boxed {\tt 116}[/tex]
Explanation:
To find the mass number of an isotope, add the number of neutrons and protons.
[tex]mass \ number = neutrons + protons[/tex]
There are 66 neutrons and 50 protons in the this isotope of tin.
[tex]mass \ number = 66+50[/tex]
Add 66 and 50.
[tex]mass \ number = 116[/tex]
The mass number of this tin isotope is 116.