How many do you find out what a particle count is for barium- 137 ?

First, you need to know the proton number of the particle is 56. And the molar mass is 137. So the neutron number is 81. Then the particle will be Barium-137. The neutron number is important because the barium has many isotopes which all have the same proton number.

B

Explanation:

Photosynthesis is the process of plants taking in sunlight and co2, thus and creating oxygen for us to breath