The same reason your mother doesn't.
Yes, the halogens did occur in nature as free elements.
how may elements occur naturally in nature
isotopes
About 80% of the first 117 elements occur in the nature in a stable manner.
118 total - 92 natural elements= 26 elements that do not naturally occur===========================
Quarks and leptons are not elements.
no. uranium and thorium occur in nature
Only Mercury occurs in nature as a liquid in its elemental state. Bromine is also a liquid element, but does not occur in its elemental form in nature.
Basically, all (or most) of the elements found in the periodic table, up to plutonium.
Food chains do not occur often in nature because, many organisms do specialize in their diets.
There are variety of such elements. They have not been found on earth's surface.
There are a lot more than 63 known elements; we are currently up to 118.Most of these elements do occur in nature, and chemists find them in various rocks, in the atmosphere, or in other assorted places. For the elements that don't occur in nature, such as technitium, those are created by the use of particle accelerators.