Fluorine.
Because:- Atoms want to become stable, for an atom to become stable, they need 8 valence electrons. Since Fluorine has 7 valence electrons, it only needs one more electron to become stable and have an octet. An octet is when an atom/element has 8 valence electrons. Since Fluorine will need to gain an electron, it will have a negative charge, and become an anion.
Condensation as it is the change of the physical state of matter from gas phase into liquid phase
Because the older cells will not be able to function properly without the new cells taking over them. :)
Just as a dozen is 12 of something, a mole is about 6.02 * 10^23 of something .
Long wave I think is the correct answer
