What defines the mass number of an isotope? A. The sum of the neutrons and protons
B. The sum of the neutrons and electrons
C. The number of neutrons
D. The number of protons

i look it up online and i'll tell you

what does the table look like

because of all the things that happen around the us, many people get into arguments which sadly could get physical, but we should actually make a change for that.

frequency, z, and the collision density, z, in carbon dioxide (co2), r 180 pm at 30 °c and 120 kpa