Final answer:
The atomic number of the element with 45 protons and an atomic mass of 65 is 45, which corresponds to Rhodium (Rh). To find the number of neutrons, subtract the atomic number from the atomic mass, yielding 20 neutrons.
Step-by-step explanation:
The atomic number of an element is defined as the number of protons in the nucleus of an atom of that element. In this case, the student has made a typo referring to '45 proteins' which should actually reference protons. Given the atomic mass of the element is 65, to find the number of neutrons, one subtracts the number of protons from the atomic mass, resulting in:
- number of neutrons = 65 - 45 = 20
Since the number of protons is equal to the atomic number, the atomic number of the element is 45. Identifying the element requires referring to the Periodic Table of Elements where you would find that the element with atomic number 45 is Rhodium (Rh).
Furthermore, the mass number of an isotope is found by adding the number of protons and neutrons together. For isotopes with 44 and 46 neutrons, the mass numbers would be 89 and 91, respectively, as per the calculation:
- Mass number with 44 neutrons = 44 + 45 = 89
- Mass number with 46 neutrons = 46 + 45 = 91