Question

Determine the number of protons, electrons, and neutrons present in an atom of sodium (Na). Explain how you determined your answer using complete sentences. (6 points)

Answer 1

11 protons
11 electrons
12 neutrons
The atomic number is 11. So that means that there are 11 protons. How ever many protons there are there will be the same amount of electrons. The mass is 22.9. Round the number to 23 and then subtract the amount of protons from 23 and then you have the amount of neutrons.

Answer 2

There are 11 protons, 11 electrons and 12 neutrons in a atom of Na.

The sodium atom has an atomic number equal to 11 and its atomic mass equal to 23, so we can deduce the amounts of protons, electrons and neutrons.

The number of protons is equal to the atomic mass, so:

                                    Number of protons = 11

As the element is neutral, that is, it is not an ion, the number of electrons is equal to the number of protons, so:

                                   Number of electrons = 11

Finally, with the information of the atomic mass we can perform the following expression:

                                      $mass = neutrons-protons$

                                                  $23 = n - 11$

                                                      $n = 12$

So:

                                 Number of neutrons = 12.

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