Here are the classifications for each substance or description:
-
W (Tungsten): Atom
-
Two or more atoms joined together: Molecule
-
Hg (Mercury): Atom
-
He (Helium): Atom
-
C6H14 (Hexane): Molecule
-
Br2 (Bromine): Molecule
So the answers are:
- Atom
- Molecule
- Atom
- Atom
- Molecule
- Molecule