Arsenic. For further information see the links below
A term used to describe any element or compound is called a substance or substances.
Sodium isn't any kind of compound. It is an element.
H2 is an element as it does not include any other elements from the Periodic Table.
A compound: any formula that contains more than one kind of atomic symbols represents a compound.
Elements of group 18 are least reactive.These are noble gases.They are unlikely to have a reaction with any element or compound.
This is a term used to describe any element or compound.
Mercury in every one of its compounds is extremely poisonous. It is still used in fluorescent lights, amalgam dental fillings, and some cosmetics.
The synonym for poisonous is toxic.
element. Sulfur dioxide (SO2) is a compound
It is a compound, not an element. N4Se4 is tetranitrogen tetraselenide
A particle diagram representing a mixture of an element and a compound would show individual atoms or molecules of the element and compound mixed together without forming any new chemical bonds. The particles of the element and compound would be distinct from each other within the mixture.
KCl is a compound not an element.