Example of objects that have chemistry behind it and should at least have one compound

No. an alpha particle is a pair of protons and a pair of neutrons, i.e. a helium

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).