Answer:

Explanation:
Cesium Lewis dot structure would look like this:
·Cs, because it only has one valence electron. But, since it has a plus, that means we lost an electron. So, we have to get rid of the dot and you have:

They both have 1 electron in their valence shell.....
For this question the answer is c
Use mv=mv, plug in the know 1x9.24=3m. Solve for m, which m is 3.08M