Helen’s high-school class visited a nearby laboratory. There, they spoke with James, a biotechnology R&D professional who told them what he does. Choose the correct way to complete each sentence. James works under the supervision of a biological scientist. He is a . James ensures that machines run correctly in the laboratory. He also enforces at the laboratory.

answer

i think the answer is a) as air pressure in an area increases, the density of the gas particles in that area decreases.

hope it

answerto predict;

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.