Why has the arrangement of the periodic table changed over time? A. Mendeleev had not placed the elements in any particular order.

B. The atomic number of an element changes so the table is frequently rearranged.

C. The table was rearranged to show elements in order of increasing atomic number rather than increasing atomic weight.

D. Elements are removed from the table once they can no longer be found in nature.

Movement that is like a t a type of wave that transfers energy where the particles in the medium move in a circle motion while the energy travels left or right. a type of wave that transfers energy where the particles in the medium move perpendicular to the direction in which the energy is traveling. transfers energy from one location to another a type of wave that transfers energy where the particles in the medium move parallel to the direction in which the energy is traveling. movement that is back and forth, like an equal sign = 1. wave 2. parallel movement 3. perpendicular movement 4. transverse wave 5. longitudinal wave 6. surface wave