In nuclear weapons plutonium exist as metal or as an alloy Pu-Ga; in nuclear fuels plutonium is as dioxide (mixed with uranium dioxide) or carbide (also possible mixed with uranium carbides).
Plutonium is a pure chemical element.
In pure form.
Plutonium is a chemical element, not a compound or mixture.
Boron is typically found in nature as a compound rather than in pure elemental form. Examples include borax, boric acid, and various borates.
Platinum is typically found in nature as a pure metal, rather than in a compound form. It is often mixed with other metals like palladium, rhodium, and iridium in the form of an ore called "platinum group metals."
Krypton is typically found in its pure form as a noble gas due to its inert nature and lack of reactivity with other elements. It does not readily form compounds with other elements.
Gold is typically used in its pure form due to its inherent properties such as high malleability and resistance to corrosion. It is commonly used in jewelry, coins, and as a store of value. However, gold can also be used in compound forms for specific applications in industries such as electronics and medicine.
Titanium is typically found in compound form, such as titanium dioxide, rather than in pure elemental form. It is commonly extracted from minerals like ilmenite and rutile, and then processed to obtain pure titanium metal.
Silver is typically found in nature in the form of compounds, such as silver sulfide or silver chloride. However, it can also be found in its pure elemental form, especially when it occurs as native silver in deposits of ore.
Pure plutonium contain only plutonium atoms.
It is a pure element, though if you are talking about sulfur in its natural form (S8), then yes it is a pure compound.
Plutonium is a brittle metal. It can shatter like glass under pressure. It is not powdery unless it has been intentionally processed into a powder form.