How is decay rate related to the half-life of a radioisotope?

a. radioisotopes with long half-lives have faster decay rates.

b. radioisotopes with short half-lives have slower decay rates.

c. radioisotopes with long half-lives have slower decay rates.

Explain which group an element with the electron configuration 1s2 2s2 2p6 3s2 3p6 3d1 4s2 belongs to.

Plz mark brainliest 30 points 1) find the momentum of a 12 kg snowball that is rolling with a velocity of 9 m/s. 2) an 8 ball with a mass of .5 kg is sitting at rest. it is hit by the cue ball (1 kg) traveling at 2.5 m/s. if the cue ball is at rest after the collision, how fast is the 8 ball traveling after the collision? 3) two football players are running toward each other. if the offensive player is 75 kg and is running 8 m/s, how fast must the 60 kg defensive player run in order for the two players to hit and stop?

12. calculate the hydroxide ion concentration of a solution with ph = 3.25. show all calculations leading to an answer