Final answer:
Aluminum is in Group 13 of the periodic table because it forms an ion with a +3 charge by losing three electrons.
Step-by-step explanation:
Aluminum is located in Group 13 of the periodic table, also known as the Boron Group. Since aluminum forms an ion with a +3 charge, it loses three electrons. This is because aluminum has three valence electrons, and by losing them, it achieves a stable electron configuration like that of the noble gas neon.
Learn more about Aluminum's group position in the periodic table