There are several other websites that describe all of this stuff, I will list a couple at the end of this post. It is important to note that from the time that the first ideas of atoms arose, and for thousands of years thereafter, there was not one shred of evidence for the particulate nature of matter or the physical existence of atoms. Each element is made of a different kind of atom, and the atoms of different elements have different masses. Pretty much everything we know about atoms is indirect evidence.
Hydrogen atoms that have captured bits of radiation given off during the formation of the first stars contain remnants of the universe right after the Big Bang. Everyone, including scientists, must start with the evidence available to the senses, and there is no directperceptual evidence for the existence of atoms. Here's a few examples: The quantum mechanical description of atoms predicts, to an astonishingly accuracy, the details of atomic spectra. Atoms always have an equal number of protons and electrons, and the number of protons and neutrons is usually the same as well. If new evidence comes along, the model gets changed. They assumed that all substances were composed of either earth, water, wind, or fire in some proportions. Adding a proton to an atom makes a … If new evidence comes along, the model gets changed. A few Greek philosophers took this idea a step further and proposed that the elements were composed of indivisible particles that were too small to see. Now that has been achieved, in an ultracold gas of caesium atoms. Adding a proton to an atom makes a …
Long before we had telescopes to see the planets and microscopes to see cells and atoms, the ancient Greeks had proposed the existence of the elements--sort of.
None of these lines of evidence “proves” the existence of atoms individually. So we can say with surety that the explanatory power of the idea of atoms far surpasses any competing idea both in its ability to explain observed phenomena, but to predict the behavior of phenomena accurately. In 1827, he noticed that tiny pollen grains suspended in still water moved about in complex paths. Sign in to like videos, comment, and subscribe. Read Book Evidence For Atoms Webquest Answers c. WebQuest: Evidence for Atoms - SCIENCEONTHEWEB.NET Atoms of different elements combine in whole number ratios, with more than one ratio being possible for a given combination of elements. Individual ions (electrically charged atoms) can be manipulated with electric and magnetic fields. The only explanation that made sense, the researchers concluded, was that the vast majority of the mass of the atom was concentrated in a very small volume… 1.5: Evidence for Atoms.
Atoms always have an equal number of protons and electrons, and the number of protons and neutrons is usually the same as well. In 1827, he noticed that tiny pollen grains suspended in still water moved about in complex paths. Atoms are so much smaller … In 1924, a French physicist named Louis de Broglie suggested that, like light, electrons could act as both particles and waves (see De Broglie Phase Wave Animation for details). What makes an object visible is the way it deflects visible light waves.
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