To identify the atom or ion, we start by examining the number of protons, which determines the element. In this case, there are 26 protons, which corresponds to the element iron (Fe) on the periodic table.
Next, we look at the number of electrons. There are 23 electrons mentioned. In a neutral atom, the number of electrons equals the number of protons. Since this atom has 3 fewer electrons than protons, it indicates that it carries a net positive charge. Specifically, with 26 protons and 23 electrons, the charge can be calculated as:
Charge = Protons – Electrons = 26 – 23 = +3
This means the atom is an ion with a +3 charge, known as a ferric ion (Fe3+).
Finally, the number of neutrons is 28. To find the atomic mass of this isotope, we can add the number of protons and neutrons:
Atomic mass = Protons + Neutrons = 26 + 28 = 54
Thus, the atom or ion in question is the ferric ion with an atomic mass of 54 (Fe3+), which has 26 protons, 23 electrons, and 28 neutrons.