Answer: Boron 11
Boron 11 is the most common isotope of boron, it represents 80% of boron found on the earth surface, it is a stable isotope metal, it occurs naturally and can also be synthesised by fission process.
Boron 11 has 5 protons and 6 neutrons.
•Uses.
Boron 11 is used in the nuclear industry.
•It is also used as neutron reflector.
•It is used in thin film applications as granules, rods, pellets, etc.