which halogen naturally exit in + ve oxydation state
Chlorine belongs to halogen family. chlorine exists as diatomic molecule in nature.
Sulfur
Less than one ounce of astatine exists on Earth. It was discovered by D.R. Corson, K.R. MacKenzie and E. Segre in 1940.
At room temperature? Salt (otherwise known as sodium chloride). If you're happy to go down to 0C then water exists as ice.
Bromine Br Atomic number 35. Number of protons-35 Neutrons-45. Electrons-35
Zinc commonly exists in compounds in the +2 oxidation state only, and as a metal with an oxidation state of 0.0, 1 and 2 oxidation states
SnCl3? The anion SnCl3- exists and in it Sn has an oxidation number of +2
Yes
The chlorine in PbCl2 exists as chloride ions, and the oxidation number of chloride ions is always -1.
Chlorine belongs to halogen family. chlorine exists as diatomic molecule in nature.
The oxidation number is 0. The sum of all oxidation number in a molecule that has not charge is always 0. If it has a charge (ion negative or positive) then the sum must be equal to the charge number.
Yes, hundreds. Hydrochloric acid (HCl) in an aqueous solution (which, I suppose, is the only way it exists) is a simple example consisting of a positive hydrogen ion (H+) and a negative chlorine ion (Cl-). Table salt (NaCl) is another example, as are all the halogen salts (halides).
plasma
Symmetry exists naturally. Look at an animal, a leaf, or a flower and you will see symmetry (one side looks like the mirror of the other).
This contains H- ion. Li shows +1 oxidation number.
There is no positive evidence that the Yeti exists
Earth