The model shows a crystal of lithium hydride. hydrogen
lithium
Which statement about lithium hydride is correct?
It is a compound because it has more than one element and a mixture because the elements are chemically combined.
It is a compound because the elements are chemically combined and a pure substance because only one type of compound is present.
It is a heterogeneous mixture because the elements are uniform throughout and a pure substance because it cannot be changed into simpler substances.
It is a homogeneous mixture because the elements are not uniform throughout and a compound because it has more than one element.