Nitrogen,N2
No Copper is a chemical element rather than a compound.
Electricity is not a compound, element, or mixture. Electricity refers to the flow of electrical charge through a conductor. It is a form of energy rather than a physical substance like a compound or a mixture.
Plutonium is a chemical element, not a compound or mixture.
Antimony is an element. Chemical symbol of it is Sb. It is in the p block.
Sodium hydroxide is an a compound; not an element. As such it has a formula rather than a symbol: NaOH.
An oxide is a compound that contains oxygen and at least one other element that is less electronegative than oxygen.
Assuming you meant Aluminium - no - it's an element.
Pepperoni is a food product made from cured and fermented meat, typically pork and beef, mixed with various spices and seasonings. It is considered a mixture rather than a compound or element.
It is the formula of the allotrope of sulfur; it is considered a compound by some chemists.
The element "Bo" does not exist in the periodic table. It is possible that "BO2" refers to a compound rather than an element.
A compound is not lighter than an element, if that element is part of the compound. Some compounds, like H2O would be lighter than, say, the element lead, but it is not lighter than the elements that make it up, i.e. hydgrogen and/or oxygen.
Vinegar is a compound. An element is anything found on the Periodic Table. A compound is anything made of more than one element.