Out of how many atoms a drop of water consists?   Water, in the chemical sense, is for the first no element, but consists of the two elements hydrogen and oxygen. A hydrogen atom is with just one proton the lightest of all. However, from the diameter, helium atoms are the smallest atoms. Number of Atoms in a drop of Water: One water molecule has a diameter of just 0.0000028 millimeter or 0.28 nm. One gram of water consists of 3,455,000,000,000,000,000,000 water molecules, respectively of 100,365,000,000,000,000,000,000 atoms. That are over one hundred billions of trillions! One drop of water weighs 0.4 gram and consists of 13,382,000,000,000,000,000,000 molecules.
A vide-store as large as a             mall in just one water drop   If one could save data in a waterdrop and one water molecule would be one Bit, than one could save 2,676,000,000,000,000,000,000 Bytes in it, respectively 2.43 billion Terabytes. That conforms 75 million years of video in a DVD-quality.
7 billion molecules per second  Cogitation-experiment: since the year 0 there live 7 billion people and sit around a waterdrop. Everyone of them pecks sustained one water molecule per second out of this drop. The drop loses 7 billion of water molecules per second since more than 2000 years! There would be SO MUCH BILLIONS of water molecules like the counter below shows.
How Small Is An Atom? Small. Very tiny small! Which diameter does one atom have? One atom does not have a specified limit, because it consists of a nucleus, which is revolved by electrons. This is the so called electronhull, which is recognized by us as the atom. The mean mass of the atom is concentrated in the nucleus, which is in the center of the atom. It contains circa 99.9 percent of the mass of the atom. The nucleus has, according to the element, a diameter of 1/100,000 to 1/10,000 of the diameter of an atom.
A piece of Cleopatra in everyone of us!   And this is not meant in the figuratively sense. Only the number of hydrogen- atoms she consisted of, count for a fictive bodyweight of 60 kilograms, was over 4 billion billion billion. As a number: 4,200,000,000,000,000,000,000,000,000. These circa 6 kilograms of hydrogen-atoms have mixed in the last more than 2000 years especially in connection with oxygen in form of water over all the oceans of the world. Of course, over all continents, too. It is similar with the carbon and all the other elements, Cleopatra consisted of. If one expects that there are 1400 cubic kilometers of water on earth, one could count really easy how many „Cleopatra-atoms“ are in one liter of water, which comes out of the ocean. 4200000000000000000000000000 divided through 1400000000000000000000000 gives 3000 hydrogen-atoms per liter! Everyone one of us consists, which quite a few guaranty, out of thousands of atoms, which have been a part of Cleopatra. See also: Visualize Very Large Numbers