The same reason your mother doesn't.
Yes, the halogens did occur in nature as free elements.
how may elements occur naturally in nature
About 80% of the first 117 elements occur in the nature in a stable manner.
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.
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.
118 total - 92 natural elements= 26 elements that do not naturally occur===========================
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.
The weighted average for all isotopes that occur in nature for an element is its atomic weight listed on the Periodic Table of the elements.
Elements that occur naturally in nature include hydrogen, helium, oxygen, carbon, nitrogen, and others. These elements make up the building blocks of all matter in the universe and are found in various compounds and substances on Earth and beyond.
Some elements occur in nature in a pure form, and not as part of a compound with other elements. Elements such as copper, silver, and gold are also minerals. Almost all pure, solid elements are mentals.