Pls !   which of the following statements about elements, atoms, and compounds is not true? compounds are smaller than atoms. elements and compounds form the basis of all materials on earth. atoms cannot be broken down into smaller substances. elements consist of one type of atom and can combine to form compounds.

Write the empirical chemical formula of calcium with a mass percent of 38.8, phosphorus with a mass percent of 20.0, and oxygen with a mass percent of 41.3.

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.

At stp, which substance is the best conductor of electricity? a. nitrogen b. neon c. sulfur d. silver