Any element, other than a halogen is - by definition - not a halogen and so it does not have a halogen and that is less than one halogen.
The element with less than one ounce existing on Earth is astatine. It is a rare halogen element and is primarily produced through artificial means due to its scarcity in nature.
Francium. Oh, and you spell it Halogen :)
it is called a halide.
No halogen gas has a mass of under 15 atomic mass units. The closest is fluorine, at 19.0 atomic mass units.
Fluorine, at 19 atomic mass units, is the only halogen gas that fits that requirement.
The halogen gas with a mass less than 15 is fluorine (F). It has an atomic mass of approximately 19.00 u, but if considering only the halogen gases, it is the lightest halogen. Fluorine is a pale yellow gas at room temperature and is highly reactive, particularly with alkali and alkaline earth metals.
The rarest element on earth is astatine and it is located in the earths crust. Astatine's availability is said to be less than a gram in weight.
alkaline earth metals
A halide is a compound consisting of two parts; a halogen and another electronegative element. The mostcommonhalogens arefluorine(F),chlorine(Cl),bromine(Br),iodine(I), andastatine(At). If put together with another element, they formfluoride,chloride,bromide,iodide, orastatide. Therefore, your question is not right since a halide consist of elements and one element can only be a halogen or non-halogen. (halogen and halide are two different things)
Less than one ounce of astatine exists on Earth. It was discovered by D.R. Corson, K.R. MacKenzie and E. Segre in 1940.
Boron makes up less than 0.001% of the Earth's crust by weight. It is a relatively rare element on Earth.
No. More reactive halogens will replace less reactive ones in a compound. This is because a more reactive halogen is more stable in a compound relative to a less reactive one, while a less reactive halogen is relatively more stable in its elemental form.