Final answer:
The ion symbol for an atom with 27 protons and 24 electrons is Co^{3+}.
Step-by-step explanation:
Ion Symbol with 27 protons and 24 electrons
The ion symbol for an atom with 27 protons and 24 electrons can be determined by subtracting the number of electrons from the number of protons. Since protons have a positive charge of +1 and electrons have a negative charge of -1, in this case, the electric charge of the ion would be +3 (+27 - +24).
Therefore, the ion symbol for an atom with 27 protons and 24 electrons would be Co3+ which represents a cobalt ion with a +3 charge.
Learn more about Ion symbol with specific proton and electron numbers