Question

name the two most important and abundant chemical elements present in the earths crust↑

Answer 1

The acronym CHNOPS, which stands for carbon, hydrogen, nitrogen, oxygen, phosphorus, sulfur, represents the six most important chemical elements whose covalent combinations make up most biological molecules on Earth

Answer 2

Silicon (Si) As the second most abundant element in the Earth's crust, silicon accounts for over 28 percent of its mass. Combined with oxygen, silicon dioxide is the most common compound in thecrust.

Abundances of the Elements in the Earth's Crust. Given the abundance of oxygen and silicon in the crust, it should not be surprising that the most abundant minerals in the earth's crust are the silicates.