Use the octet rule to predict the formula of the compound that would form between phosphorus and iodine, if the molecule contains only one phosphorus atom and only single bonds are formed.
Formula:

1.75 is the weight of one medium egg

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).

Not a  mixture of two common elements that can be separated by physical means.