gold and silver
I wouldn't say that many chemicals occur naturally in the air, however Oxygen and Nitrogen are the two main gases that make up the Earth's atmosphere.
Combined elements refer to two or more substances or components that have been physically or chemically mixed together to create a new compound or mixture. These combined elements can exhibit properties different from those of the individual elements.
Two nonmetals that occur in the free state are oxygen and nitrogen. These elements are abundant in the Earth's atmosphere and exist as diatomic molecules (O2 and N2).
Bismuth is the only naturally-occurring element that has no stable isotopes. Technetium and promethium are the other two elements that do not have any stable isotopes and are only found in trace amounts or are synthetically produced.
Two elements to begin are hydrogen's to make a neutron (deuterium) then after helium is fused (three) to make carbon and two carbons to make a magnesium-24. So vague question.... Cosmic Ray...www.ScienceIsGolden.com
Uranium and thorium are the two actinides that occur naturally in the Earth's crust. They are found in low concentrations and have important roles in various nuclear reactions and processes.
No, only the elements up to Uranium (Z=92) occur naturally on Earth. The rest have only been made synthetically, because of their radioactivity which renders them unstable and thus unable to exist naturally. The synthetically made elements are called transuranic elements.
Naturally occurring and man made elements
I wouldn't say that many chemicals occur naturally in the air, however Oxygen and Nitrogen are the two main gases that make up the Earth's atmosphere.
nintey two
The molecular formula
There are two types - distinguishable by ear size. The African or the Indian elephant
The two elements that commonly occur within the earth crust are Oxygen and Silicon.
Water is a compound of Hydrogen and Oxygen (H2O) and is formed naturally when the two elements meet in the right conditions.
Two non-metal elements must join for a covalent bond to occur. Covalent bonds involve the sharing of electrons between atoms to achieve a stable electron configuration.
Combined elements refer to two or more substances or components that have been physically or chemically mixed together to create a new compound or mixture. These combined elements can exhibit properties different from those of the individual elements.
Two elements that commonly occur in nature as liquids are mercury and bromine. Mercury is a naturally occurring liquid metal, while bromine is a non-metallic element that exists as a liquid at room temperature.