Final answer:
The ion with 26 protons, 29 neutrons, and 23 electrons is represented by the symbol Cr²+. The element is chromium (Cr) which has lost two electrons and carries a positive charge.
Step-by-step explanation:
The ion with 26 protons, 29 neutrons, and 23 electrons is represented by the symbol Cr2+. The atomic number of 26 belongs to the element chromium (Cr), and the 2+ charge indicates that it has lost two electrons. The superscript plus sign indicates a positive charge.
Learn more about Ion Symbol