Which of the following is true in regard to ions?
a. ions can only carry positive charges.
b. an ionized atom has a number of protons that is unequal to the number of electrons.
c. a cation will hold a positive charge if it gains one or more electrons.
d. losing one or more electrons will turn an atom into an anion.

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.