chlorine
* Fluorine is found on Earth at about 585 mg/kg (crust) 1.3 mg/liter (ocean) * Chlorine is found on Earth at about 145 mg/kg (crust) 19400 mg/liter (ocean) * Bromine is found on Earth at about 2.4 mg/kg (crust) 67.3 mg/liter (ocean) * Iodine is found on Earth at about 0.45 mg/kg (crust) 0.06 mg/liter (ocean) * Astatine is not found on Earth in appreciable quantities (it has no stable isotopes) Earth's crust is about 8.5 * 1020 kg Earth's ocean is about 1.4 * 1018 liters This make fluorine the most abundant halogen *on Earth*, with chlorine 30% as abundant by mass, and 16% as abundant in number of atoms. Fluorine only has one stable isotope, whereas chlorine has two. Otherwise the race would not be even that close.
Oxygen is the most abundant element on Earth. It comprises 49.5 percent of the total mass (amount) of the Earth's crust, waters, and atmosphere.
It is the most abundant element in the body.
The most abundant element where? It is the most abundant element in Earth's crust. The most abundant element on planet Earth, on the other hand, is iron, while the most abundant element in the Universe is hydrogen.
D-glucose is the most abundant D-aldohexose in the biological world. It is a primary source of energy for living organisms and plays a key role in cellular respiration and other metabolic processes.
The most abundant halogen on Earth is chlorine. It is commonly found in seawater, salt deposits, and as part of various minerals.
As far as the Earth goes, fluorine is the most abundant halogen present in the Earth's crust. Chlorine, however, is the most abundant halogen in the universe.
Hydrogen is the most abundant element in the known Universe; helium is second.
cellulose is the most abundant organic compound in the world
According to the source I found on the Web: "Of the halogens, fluorine has the highest crustal abundance (544 mg/kg) while iodine has the lowest (0.25 mg/kg), however, chlorine is by far the most abundant halogen in the cosmos." It's fluorine if you're only interested in the Earth's crust, or chlorine if you're interested in the whole solar system or an even wider field than that.
Hydrogen is the most abundant element in the known Universe; helium is second.
* Fluorine is found on Earth at about 585 mg/kg (crust) 1.3 mg/liter (ocean) * Chlorine is found on Earth at about 145 mg/kg (crust) 19400 mg/liter (ocean) * Bromine is found on Earth at about 2.4 mg/kg (crust) 67.3 mg/liter (ocean) * Iodine is found on Earth at about 0.45 mg/kg (crust) 0.06 mg/liter (ocean) * Astatine is not found on Earth in appreciable quantities (it has no stable isotopes) Earth's crust is about 8.5 * 1020 kg Earth's ocean is about 1.4 * 1018 liters This make fluorine the most abundant halogen *on Earth*, with chlorine 30% as abundant by mass, and 16% as abundant in number of atoms. Fluorine only has one stable isotope, whereas chlorine has two. Otherwise the race would not be even that close.
This halogen is astatine.
Water is the most abundant natural resource in the world, covering about 70% of the Earth's surface.
Oxygen is the most abundant element on Earth. It comprises 49.5 percent of the total mass (amount) of the Earth's crust, waters, and atmosphere.
The most abundant source would be in glacial form as frozen water, although the most abundant and accessible source is groundwater.
Chlorine is a chemical element with symbol Cl and atomic number 17. Chlorine is in the halogen group (17). Chlorine is most commonly found in sodium chloride. . It is the second most abundant halogen and 21st most abundant chemical element in Earth's crust. The great oxidizing potential of chlorine led it to its bleaching and disinfectant uses, as well as uses of an essential reagent in the chemical industry. As a common disinfectant, chlorine compounds are used in swimming pools to keep them clean and sanitary.