What is the pH of a solution that has a hydrogen ion concentration is 1.5 x 10 -3 M

If a hydrogen atom is neutral, it must also have  one electron. an oxygen atom (o) has an atomic number of eight (8). this means a neutral oxygen atom has eight protons and eight electrons. the element actium (ac) has an atomic number of 89, so it has 89 protons and 89 electrons in a neutral atom

And a) oxygen i believe

Sorry i think the answer is b