Oxygen has an atomic number of eight. Which of the following is an isotope of an oxygen atom with a mass number of 16?  1. An oxygen atom with a charge that is +1

2. An oxygen atom with nine neutrons

3. An oxygen atom with nine protons

4. Oxygen atom with nine electrons

When the ionic compound nabr dissolves in water, br– ions are pulled into solution by the attraction between what two particles? a. the na+ and br– ions b. the na+ ion and the negative end of a water molecule c. the br– ion and the positive end of a water molecule d. the br– ion and the negative end of a water molecule