Answer:
Step-by-step explanation:
Part 1
Proton is located in the nucleus and has a charge of +1
Neutron is located in the nucleus and has no charge.
Electron is located outside the nucleus and has a charge of -1. Amu is .00055.
Part 2
Potassium has 19 protons, (39 - 19 = 20 neutrons), and 19 electrons.
Calcium has 20 protons, (40 - 20 = 20 neutrons), and 20 electrons.
Part 3
Isotopes have different numbers of neutrons.
Most common isotope of carbon is carbon-12. Carbon-12 has 6 protons, 6 neutrons, and 6 electrons.
Boron-10 has 5 protons, 5 neutrons, and 5 electrons.
Boron-11 has 5 protons, 6 neutrons, and 5 electrons.
Note: In neutral elements, as you have here, the number of protons equals the number of electrons.
To find the number of protons, use the atomic number, which is above the symbol for the element on your worksheet.
To find the number of neutrons, subtract the protons from the mass of the element. Example Boron-11 has a mass of 11, so 11 - 5 protons = 6 neutrons.