If you know an element's atomic number and atomic weight, you can determine the following information for a neutral atom:
The number of protons, electrons, and neutrons.
- The atomic number indicates the number of protons.
- For a neutral atom, the number of electrons equals the number of protons.
- The atomic weight (or atomic mass) is approximately the sum of protons and neutrons. You can calculate the number of neutrons by subtracting the atomic number (number of protons) from the atomic weight (rounded to the nearest whole number).
Therefore, the correct response is:
the number of protons, electrons, and neutrons.