Find a, b, and c
number of protons=a
number of neutrons=7
atomic number=b
mass number=15
element symbol=c
~ provide explanation~

Electrons = protons
protons = atomic number
protons + neutrons = atomic mass

Therefore: a) protons + 7 = 15
                        protons= 15 -7
                        protons= 8

B) Remember proton = atomic number
     so atomic number = 8

C)Now we know the atomic number so we can easily check on the periodic table what element has an atomic number of 8, which is Oxygen

What do you mean by that? like the contents? the thc level?

  super sorry but i dont know lo