Yes.
The elemental symbol for Platinum is Pt.
No, Octane (C8H18) is not an elemental substance. It is a hydrocarbon compound composed of carbon and hydrogen atoms.
Yes, a molecule can be an elemental substance if it is made up of atoms of the same element bonded together. For example, O2 is a molecule of the elemental substance oxygen, composed of two oxygen atoms bonded together.
CH4 is the formula for methane meaning it is a compound substance.
It is none of these. It is a metallic elemental mineral.
Molecule, or atom in the case of a pure elemental substance.
It's an elemental compound
elemental copper
0 in elemental form, +2 and +4 in its compounds
Atoms
Platinum is an elemental, metallic mineral.
No. By definition an element is not a mixture.