On a mission to a newly discovered planet, an astronaut finds gallium abundances of 61.29% for 69ga and 39.71% for 71ga. what is the atomic mass of gallium for this location? . the mass of 69ga is 68.7200amu. the mass of 71ga is 70.9200amu.

Complete the table for ion charge based upon their losing or gaining electrons in the outer shell. (use the periodic table as necessary.) group most likely ionic charge # of valence electrons i +1 ii +2 iii +3 iv +4 or -4 v -3 vi -2 vii -1 viii 0

Americium-241 undergoes fission to produce three neutrons per fission event. if a neutron-absorbing material is mixed in with this sample so that the rate of neutron production drops down to 1.8 neutrons per fission event, which will be effective at achieving a critical mass? check all that apply. remove a deflective shield surrounding the sample. remove absorbent material mixed in with the sample. compress the sample of americium-241.

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?