How many neutrons does element x have if its atomic number is 31 and its mass number is 84?

Atomic number is protons + electrons

Mass number is protons + neutrons

So to calculate the number of neutrons, you do

atomic number - atomic mass

31 - 84 = - 53

Explanation:

nacl is added to the aqueous of what? ? in order to get a proper answer you have to specify the exact composition of the aqueous solution.

a boiling water reactor does not boil the water. a pressurized water reactor boils the water faster. a pressurized water reactor is heated directly by the core. a pressurized water reactor does not use fission.