By definition, an ion with 5 protons, 6 neutrons and a charge of 3+ has an atomic number of 5.
Atoms are made up of a nucleus (made up of protons and neutrons) and a shell made up of electrons.
Protons are positively charged, neutrons are electrically neutral. Therefore the atomic nucleus always has a positive charge. On the other hand, electrons are negatively charged.
The atomic number is the number of protons found in the nucleus of an atom and varies from one element to another, depending on their properties. In an electrically neutral atom, that is, the electric charge is cerp, a number of protons coincides with the number of electrons.
In this case, an ion contains 5 protons. So the atomic number is 5.
In summary, an ion with 5 protons, 6 neutrons and a charge of 3+ has an atomic number of 5.
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