Which substance cannot be broken down by chemical means? (1)aluminum(2)ammonia(3)aluminum oxide(4)ammonium chloride

The rules of engagement (roe) working group is often used to (select all that apply.)

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.

How can the periodic table be used to predict the behavior of elements?