4. A
because PbCl2 is an ionic compound and it's solid, so it's a substance.
It cannot be mixture, because it's a pure molecule.
5. D
despite that both substances are gases, colorless they are different molecules, so they should have different either chemical and physical properties
6. C
this substance made from W atoms and others are made from molecules
Answer:
I don't really know what that is so here is a picture of it
Explanation:
It is the darmstadtium element that has the electron configuration above and the atomic number of 110
Hello there,
Your correct answer would be "<span>the energy of a photon".
Hope this helps.
~Hottwizzlers
</span>
The fact that you want to yes is funny
