Let's start with the charge. We have a +3 charge for this ion, which means it needs 3 more electrons in order to be neutral.
Knowing this we can add 3 electrons to the given number of electrons of the ion to know what is the number of electrons for the neutral form.
Write the symbol for each of the following ions:
(a) the ion with a 3+ charge, 28 electrons, and a mass number of 71
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