What group of elements generally have the lowest second ionization energy?

Helium decays to form lithium. which equation correctly describes this decay?

A5 mole sample of liquid acetone is converted to a gas at 75.0°c. if 628 j are required to raise the temperature of the liquid to the boiling point, 15.600 kj are required to evaporate the liquid, and 712 j are required to raise the final temperature to 75.0°c, what is the total energy required for the conversion?

Which organism develops breathing organism develops breathing organs from pharyngeal arches? shark, spider, sea star, sea horse