Chlorine is an element, but chlorine gas in it's pure state is a diatomic molecule, meaning it is two of the same atom covalently bonded. all halogen gases do this, plus a couple others. A good way to remember this is HOFBrINCl. Hydrogen, Oxygen, Florine, Bromine, Iodine, Nitrogen, and Chlorine. All of them ARE NEVER alone in their pure form, they are always diatomic.
No such substance as 'sodium chlorine'. I think you mean 'sodium chloride'. I which case it is an ionic compound. Separately , sodium(metal) is an element and chlorine(gas) is an element. They both appear in the Periodic Table. 'Mixture', does not come into question.
No. It's a molecular element.
ClO4 is not a compound, it exists as ClO4-, which is a polyatomic ion called the perchlorate ion. Some positive ion such as potassium or ammonium must be present to balance the charge and form a compound.
Hydrogen chloride is a compound made from hydrogen and chlorine; the two are elements by themselves.
Cl, chlorine is an element, Cl2 is the molecular form of the element. When 'free' chlorine is so reactive that it will react with itself to form diatomic (2 atoms) molecules, but it is still an element.
Element.
No. It's a molecular element.
chlorine is not a compound. it is an element.
Chlorine is an element.
Chlorine is an element.
No such substance as 'sodium chlorine'. I think you mean 'sodium chloride'. I which case it is an ionic compound. Separately , sodium(metal) is an element and chlorine(gas) is an element. They both appear in the Periodic Table. 'Mixture', does not come into question.
Chlorine (chemical symbol Cl) is an element. The molecular formula for chlorine as a gas is Cl2. It is not a compound because it's just one element; compounds have two or more elements chemically combined.
Chlorine is a nonmetal but its is an element, not a compound.
Chlorine is an element on the periodic table. If you look, its average atomic mass is 35.5 amus. It would be a compound if it was 'connected' with another element, ie Hydrogen. HCl is considered a compound, but chlorine (Cl) alone is just an element.
Chlorine is not a metalloid. It is a non metal.
No. Chlorine gas is 100% chlorine and nothing else.
compound =]