The answer is 20.5
Subtract both 7.5 and 22 from 50
50-7.5 = 42.5
42.5 - 22 = 20.5
Hope this helps :)
On where did you post it ?
I believe the correct answer from the choices listed above is the second option. If an oxygen atom has 8 protons and 10 neutrons in its nucleus, then its atomic number would be 8. The atomic number is <span>the number of protons in the nucleus of an atom. Hope this answers the question.</span>
