Answer:
Energy is added to the particles in each change, but boiling requires more energy than melting because the attractions must be completely overcome.
Answer:
Helium
Explanation: The ionization energy decreases from the top to bottom in groups. And increases from left to the right across a period. Therefor Helium has tge largest first ionization energy, while francium has one of the lowest.
Organic compounds
If you need an explanation I can give one!
