Elon Musk has decided to send a manned vehicle to Mars. He has personally selected a highly qualified astronaut named Frank.
Describe 2 accommodations Elon Musk must ensure the space craft has
to have to have a successful round trip to Mars and back home to
Earth.
Describe 3 accommodations Frank will need in order to survive the
journey.

Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.

The atomic radius of sodium is 186 pm and of chlorine is 100 pm. the ionic radius for na+ is 102 pm and for cl– is 181 pm. in going from na to cl in period 3, why does the atomic radius decrease while the ionic radius increases? a. the inner electrons in the sodium cation shield its valence electrons more effectively than the inner electrons in the chloride anion do. b. the inner electrons shield the valence electrons more effectively in the chlorine atom than in the chloride anion. c. the outermost electrons in chloride experience a smaller effective nuclear charge than those in the sodium cation do. d. the outermost electrons in chloride experience a larger effective nuclear charge than those in the sodium cation do. e. monatomic ions are bigger than the atoms from which they are formed.

Energy defines the different "states" of matter. in no more than 3 sentences, describe the amount of kinetic energy that each of the 3 states of matter possesses and relate that to the atom/molecular motion of each "state".