Silicon is, after oxygen, the most abundant element of the Earth's crust. But although about 75% of the Earth is made from silica — or silicon dioxide (SiO 2), the main constituent of silicate ...

There are 17 rare earth elements (REEs) in all — 15 lanthanides plus yttrium and scandium. It's a fairly diverse group, with ...

Atomic number 16, atomic weight 32.064. Silicon (Si): Silicon is the second most abundant element in the earth's crust and can be found in rocks, sand and clay. It acts as a deoxidizer in steel ...

Look down at your feet. If you dig a little deeper you should stumble upon the second most abundant element on Earth: silicon. It makes up about 25% of the Earth's crust by weight 1. But in the ...

Despite the name, most REEs are not particularly rare. They were called “rare-earth elements” because, when they were ...

On the heels of massive US tariffs, China’s recent export curbs on 7 rare earth elements expose a key US vulnerability: ...