Answer:

Oxygen: This familiar element, is number 6 on the periodic table of elements, makes up about 47 percent of the mass of the crust, and is also abundant (fortunately) in the atmosphere.Since oxygen atoms are light compared to the other predominant elements in Earth's crust, the fact that their total mass accounts for almost half of the crust means that the fraction of its atoms that consists of oxygen is even higher than the mass fraction.

Explanation:

Answer:

Oxygen

Explanation:

Most of the earth's crust, or outer layer, is made up of eight elements. Oxygen tops the list in terms of abundance, with the planet's shell being composed of almost 47% of this nonmetallic chemical element. Silicon posts a second-place ranking at nearly 28% by weight.

Which element makes up 50% of the earth's crust?

Together, the elements oxygen and silicon make up most of the Earth's crust including silicate minerals such as quartz and feldspar.