Compound
Pizza is not an element or a compound. It is a mixture of compounds. Also it does not have a specified chemical composition.
its a heterogeneous mixture
heterogeneous mixture.. maybe
A pizza is an example of a mixture because it is made up of different substances such as dough, cheese, sauce, and toppings, each retaining their own properties. It is not a pure substance like an element or compound.
element. Sulfur dioxide (SO2) is a compound
KCl is a compound not an element.
First of all you have mispelled it as 'hellium' . It is 'HELIUM'. It is an element. It atomic No. is '2' , so therefore it is found in position number '2' in the Periodic Table, as 'He'. It is neither a compound nor a mixture. The chemical symbol for helium is 'He '. It's Atomic Mass is '4' It is compsed of 2 protons, 2 neutrons and two electrons. It is the MOST Noble(Inert) of all the elements. It does NOT react with anything. Therefore it exists 'monatomically' (single atoms). Its condensing point is 7 K ( - 266 oC) (Becomes a liquid) Its freezing point is 4 K . ( - 269 oC) (becomes a solid). The name 'helium' is from Classical Greece, and means 'from the Sun'(Helios), because two hydrogen atoms fuse together in the Sun , they form 'Helium'.
Beryllium is an element. It is not a compound
cornstarch is a compound element.
Mixture
if it dissolves its a compound if not its an element.