Pressure and volume changes at a constant temperature can be calculated using select one:
a. charles's law.
b. kelvin's law.
c. dalton's law.
d. boyle's law.

Pressure and volume changes at constant temperature using boyle's law.

Outermost (valence) electrons

Ithink this is what you meant. the temperature at which a liquid begins to boil is called the boiling point. the boiling point of water is 212°f or 100°c.  and at that point will start to turn into steam (gas)