Elemental, as in "elemental copper" as opposed to copper ore. It's POSSIBLE that the word you're looking for might be "noble" though some metals that are not noble metals can occasionally be found in elemental form: iron meteorites, for example.
Probably in ionic compounds where they act as anions. I don't think OBr2 will exist everywhere at all.
No. A number of minerals are elements that occur naturally in "pure" or elemental form. Gold is probably the best example. Gold is called a "noble metal" because it doesn't combine chemically with very much. Gold nuggets and gold "dust" are pretty much pure gold. Another mineral we work hard to recover is diamond. The finest of the uncolored diamonds are pretty much pure carbon. Graphite, which we mine to make pencil lead (and a host of industrial items) is pretty much pure carbon as well.
Color is often the least useful characteristic in identifying minerals because many minerals can occur in a variety of colors due to impurities. Instead, properties like hardness, luster, cleavage, and streak are more reliable for identifying minerals.
Yes. Aluminum-based minerals occur in all three of the main rock types, including igneous rocks.
Rocks are made up of minerals, which are naturally occurring inorganic substances with a specific chemical composition and crystal structure. While minerals contribute to the formation of rocks, not all minerals are present in rocks. Rocks can contain a mixture of minerals and other materials, whereas minerals occur naturally as individual crystals or grains.
Copper, Silver, and Gold occur as elements instead of compounds.
Copper, Silver, and Gold occur as elements instead of compounds.
Copper, Silver, and Gold occur as elements instead of compounds.
Copper, Silver, and Gold occur as elements instead of compounds.
Gold, silver, copper, and sulfur are examples of minerals that occur as elements rather than compounds. These minerals are made up of a single type of atom, which gives them their unique chemical and physical properties.
Bromine is a naturally occurring element found in the Earth's crust. It is typically found in compounds with other elements such as sodium chloride (table salt) and in seawater. Bromine also occurs as a trace element in minerals such as brucite and carnallite.
Many organic compounds are insoluble in water. They have carbon and hydrogen as elements.
They can be either. Gold and carbon are both elements that occur as minerals in element form. Carbon in fact takes two mineral forms: graphite and diamond. Most minerals are compounds. Some of the simpler ones include silicon dioxide (quartz), aluminum oxide (corundum), and sodium chloride (halite).
Sodium is a highly reactive element that easily forms compounds with other elements, such as chlorine in the form of sodium chloride (table salt). This tendency to react with other substances means that pure sodium is not typically found in nature. Instead, sodium is usually found in compounds in minerals or in seawater.
Germanium is a naturally occurring element, but does not occur in pure form on the Earth (only in compounds).
Magnesium is found in the Earth's crust, primarily in minerals such as dolomite, magnesite, and brucite. While it does occur naturally, it is typically not found in its pure form in significant quantities due to its high reactivity with other elements. Instead, it is usually found in compounds that require extraction processes to isolate the pure element.
Compounds occur naturally when different elements chemically bond together through various natural processes such as photosynthesis, volcanic activity, or biological reactions. These compounds can be found in minerals, plants, animals, or geological formations in the environment.