Name the most abundant metal in the Earth’s crust. Also name its most important ore.

Most abundant metal in the Earth’s crust:

• Aluminium is the most abundant metal in the Earth’s crust with an abundance of around 8.2%.
• The most abundant non-metal in earth's crust is Oxygen (46%).

Most important ore of aluminium:

• Bauxite is Aluminium’s most important ore.
• Its chemical formula is $A{l}_2{O}_3.2H_{2}O$
• Through Bauxite, almost $98\%$ of Aluminium is produced commercially.

Aluminium is the most abundant metal in the Earth’s crust and Bauxite ore is the most important ore of Aluminium.