Final answer:
The electron configuration for B³⁺ is 1s²2s².
Step-by-step explanation:
The electron configuration for B³⁺ is 1s²2s²2p¹. To determine the electron configuration for an ion, first write the electron configuration for the neutral atom, and then remove the appropriate number of electrons to match the ion's charge.
B has an atomic number of 5, so its neutral atom configuration is 1s²2s²2p¹. Since B³⁺ has a 3+ charge, we need to remove 3 electrons. Starting with the highest energy level, the 2p orbital, we remove all three electrons: 1s²2s²2p⁰. Therefore, the electron configuration for B³⁺ is 1s²2s².