Is oxygen with 10 total electrons an atom or an ion

What is the atomic number of an atom that has 6 protons

Five different substances are given to you to be dissolved in water. which substances are most likely to undergo dissolution in water? check all that apply. view available hint(s) check all that apply. sodium fluoride, naf octane, c8h18 propanol, ch3ch2ch2oh potassium iodide, ki benzene, c6h6

What is the amount of energy for a photon that has a 125 cm wavelength