science homework help???!!!?

8 protons and 9 neutrons

8 protons in the nucleus
10 neutrons in the nucleus
8 electrons outside the nucleus in various energy levels (these are NOT in the nucleus)

If you wanted to take it one more step, the protons are made up of two up quarks and one down quark.

I will leave you to look up the quark composition of the neutron.

You could also include the existence of gluons, if so desired. These particles transmit the strong force, which binds the quarks together. It is collectively referred to as the gluon field. I did not look to see which specific gluons are involved with protons and neutrons.

Number and type of particles in the nucleus of the atoms of oxygen

The atomic number of an oxygen atom is 8 - There are 8 protons in the nucleus

the mass number of an atom of oxygen is 18 This particular O atom will have 10 protons in the nucleus.