silicon dioxide is sand
Silicon is just silicone and silicone dioxide is one part silicon to every two parts oxygen.
silicon dioxide is an acid
The molecular formula for silicon dioxide is SiO2, so there are a total of three atoms; one silicon atom, and two oxygen atoms.
Silicon (1) Oxygen (2)
compound
SiO2 is not an element, it is the compound silicon dioxide.
Silicon dioxide is an additive used in food. It is also referred to as silica and there is no known side effects when consumed.
It is made out of sand which is silicone dioxide also called quartz.
Being that it is basically sand or silica, I would have to say that it's a given that it is gluten free. Actually, this is a misspelling of silicon dioxide. Silicone is a completely different substance.
Light, water, and carbon dioxide.
Assuming that the questioner meant to write "silicon dioxide", it is a giant molecule compound with formula SiO2.
One can purchase silicone spatulas from a variety of online retailers. Amazon, Crate&Barrel, John Lewis, and Target all have online stores where one can purchase silicone spatulas.