Final answer:
2. Aluminum is the most abundant metal in Earth's crust and a member of the Boron family, surpassing the abundance of boron, silicon, and carbon.
Step-by-step explanation:
The member of the Boron family and the most abundant metal in Earth's crust is 2. aluminum. Aluminum, with atomic number 13 and chemical symbol Al, is not only a member of the Boron family (group 13 of the periodic table) but also the most prevalent metal, accounting for about 8.2% of the Earth's crust by weight.
This surpasses the abundance of silicon, carbon, or boron, making it a significant material in a variety of applications, from industrial manufacturing to everyday products.
Unlike boron, which is a metalloid and less common in the Earth's crust, aluminum is classified as a metal and does not naturally occur in its metallic form, but rather as compounds like bauxite.