If something has a mass of 4.2 g and a volume of 6 mm what is the density of the substance

In the 1800s, one of the statements in john dalton's atomic theory was that atoms are indivisible. later experimental evidence led to the discovery of subatomic particles such as neutrons, electrons, and protons. what happened to the indivisible atom part of dalton's atomic theory, and why?

Amap that uses a range of colors and shading to represent the elevation, depth, or landscape of specific features on earth is a/an map.

How many moles of oxygen gas are produced from the decomposition of six moles of potassium chlorate