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.
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Any chemical substance that contains only one kind of atoms is an element, therefore Cl2 (chlorine) is an element.
Cl2 is molecular chlorine. Chlorine is diatomic, meaning it will naturally pair up.
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.
No. It's a molecular element.
PB is an element. It is the chemical symbol for lead.
Ag is the chemical symbol for silver, which is an element. It is not a compound.
Hl is an element. It is the chemical symbol for the element helium on the periodic table.