Science questions, please help I will give brainliest, to the correct answer. Someone please help me.

Achange in the number of neutrons in an atom will change an blank . when the number of protons changes in an atom, a new element will form.

Find the mass in grams of 1.37x1020 particles of h3po4

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?