Chlorine is an element, because it is in the Periodic Table.
It forms the elemental molecule Cl2 ( Cl - Cl)
It is a green extremely poisonous gas. Not found directly in nature , but only as it anions Cl^- & ClO^- etc., in NaCl ( Sodium Chloride - common salt) , and Ca(ClO)2 ( a bleach).
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Chlorine is an element. It is a highly reactive gas that belongs to the halogen group on the periodic table, with the atomic number 17.
the element chlorine is very common. its used in most disinfectant cleaners and used in Swimming Pools.
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.
Sodium hypochlorite is a compound, not an element. It is composed of sodium, chlorine, and oxygen atoms.
The element that forms a compound with chlorine with the general formula MCl is metal. The "M" in MCl represents an arbitrary metal element.
NaCl is a compound consisting of sodium (Na) and chlorine (Cl) atoms bonded together. It is not an element.
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.