Which statement accurately describes the illustration?

a. hydrogen has a valence of 2 and oxygen has a valence of 6
b. hydrogen has a valence of 1 and oxygen has a valence of 8
c. hydrogen has a valence of 1 and oxygen has a valence of 2
d. hydrogen has a valence of 1 and oxygen has a valence of 6

i think d, but i'm not completely sure.

The midpoints? a, b, and c are marked on the histogram. match them to the indicated scores. which? scores, if? any, would be considered? unusual?

While the change in blank will remain the same during a collision, the force needed to bring an object to a stop can be blank if the time if collision is blank

Cyclotrons are widely used in nuclear medicine for producing short-lived radioactive isotopes. these cyclotrons typically accelerate h- (the hydride ion, which has one proton and two electrons) to an energy of 5 mev to 20 mev. this ion has a mass very close to that of a proton because the electron mass is negligible—about 1 2000 of the proton’s mass. a typical magnetic field in such cyclotrons is 1.9 t. (a) what is the speed of a 5.0-mev h-? (b) if the h- has energy 5.0 mev and b = 1.9 t, what is the radius of this ion’s circular orbit?