Question

how many protons are found in the nucleus of a boron 11

Answer 1

There are 5 protons, 5 electrons and 6 neutrons

Answer 2

Boron 11 is one of two stable isotopes of Boron. and in natural samples about 80-81% of the element is Boron-11 and 19-20% is Boron-10. 

atomic number = 5
atomic mass = 11