Photons are not considered as objects in the traditional sense, as they cannot exist in a
stationary state.

a. true

b. false

No table found. the question asks for covalent bond based on electronegativies

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).