They are nouns.
Silicon + Water
The silicon-oxygen tetrahedron is the building block of silicate minerals. The word "silicate" means the compound contains silicon in some form.
The word "to be" in a grammatical sentence usually means future.
A single word does not and cannot have a grammatical structure.The word 'yet' does not have a past tense
the root word is "grammar"
grammar
The word she is a pronoun.
The Oxford Dictionary says 'Silicon'
The word possible is an adjective.
No, this is not a grammatical word in the English Language.
SiO2, the clue is the 'di' suffix before the word oxide , meaning two.
Without modifiers, the word "sand" refers to a substance that is almost entirely silicon dioxide.