Help with this question

so you know that   Oxygen. A, number of protons and neutrons=16 and Z, number of protons=8

so...you find the amount of neutrons a-z=n

16-8=n

16-8=8

then for oxygen A number of protons and neutrons,=18,Z,number of neutrons=8

so18-8=N

18-8=10

so the difference is in the number of there neutrons, and the main reason of them being a isotope.

h let me think

a saline water is fed to a reverse osmosis unit at flow rate o rotameter connected to reject (retentate) line reads 8 installed in reject and permeate line reads 15.2 milli siemens/cm and 300 micro siemens/com respectively.