Which of the following statements about neutrons is true
a : neutrons make an atom more stable
b: isotopes if an element have the same number of neutrons
c: the number of neutrons in an atom determines what element it is
d: neutrons have much less mass than protons or electrons

Two people each hold the end of a rope and create waves by moving their arms up and down. this wave is best classified as a transverse wave because a) both the rope particles and the wave are moving in the same direction. b) the wave is moving up and down as the particles of the rope move horizontally. c) the wave is moving horizontally as the particles of the rope move up and down. eliminate d) the wave is moving in a parallel direction with the motion of the person's arms.