https://padlet.com/creillo0306/ezhi59k89xpnfw9d ❝ The Discovery of Something Remarkably Small ❞ In many ways, the discovery of atoms has truly evolved over the years. Going thru multiple experiments and tests, we can say that for something so small and tiny, it is outstandingly remarkable! Let's learn more about this evolution, shall we? en-us 2022-02-07 13:25:31 UTC 2022-02-09 06:06:44 UTC hello@padlet.com https://padlet.net/icons/png/1f52c.png creillo0306 https://padlet.com/creillo0306/ezhi59k89xpnfw9d/wish/2033101263 Democritus expressed his belief that matter consists of small, solid particles which he called atoms. He discovered that these small objects cannot be broken down any further. Democritus concludes that all things are composed of atomos that are too small to be seen by the unaided eye. He explains that there are empty spaces between the inner structures of matter which have a uniform structure all throughout yet still vary in shape, size, and weight.]]> 2022-02-07 13:58:07 UTC https://padlet.com/creillo0306/ezhi59k89xpnfw9d/wish/2033101263 creillo0306 https://padlet.com/creillo0306/ezhi59k89xpnfw9d/wish/2033125493 In the early 1800s, the English Chemist, John Dalton, conducted a number of experiments that eventually led to the acceptance of the idea of atoms. He concluded that atoms are invisible and indestructible particles. He deduced that all elements are composed of atoms, therefore, atoms of the same elements are exactly alike meanwhile atoms of different elements are different. On the other hand, compounds are formed by the joining of atoms of two or more elements.]]> 2022-02-07 14:07:57 UTC https://padlet.com/creillo0306/ezhi59k89xpnfw9d/wish/2033125493 creillo0306 https://padlet.com/creillo0306/ezhi59k89xpnfw9d/wish/2033168180 Dalton's Atomic Model is the first representation that matter is made up of atoms which he represented with solid, hard spheres. ]]> 2022-02-07 14:22:05 UTC https://padlet.com/creillo0306/ezhi59k89xpnfw9d/wish/2033168180 creillo0306 https://padlet.com/creillo0306/ezhi59k89xpnfw9d/wish/2033189069 In 1897, the English scientist, Joseph John Thomson, provided the first hint that atoms are made up of even smaller particles.
The Cathode Ray Experiment ─ J.J. Thomson applied a high electric voltage on both ends of the tubs between two electrodes. He observed a particle stream coming out of the negatively charged electrode the positively charged electrode.]]> 2022-02-07 14:30:08 UTC https://padlet.com/creillo0306/ezhi59k89xpnfw9d/wish/2033189069 creillo0306 https://padlet.com/creillo0306/ezhi59k89xpnfw9d/wish/2034442559 J.J. Thomson's Atomic Model represents an atom being a positively-charged structure with negatively-charged electrons scattered like plum in a pudding.]]> 2022-02-08 01:59:10 UTC https://padlet.com/creillo0306/ezhi59k89xpnfw9d/wish/2034442559 creillo0306 https://padlet.com/creillo0306/ezhi59k89xpnfw9d/wish/2034445234 In 1908, the English Physicist, Ernest Rutherford, performed his gold foil experiment and discovered another subatomic particle.
The Gold Foil Experiment ─ This experiment involved firing a stream of positively-charged particles at a thin sheet of gold foil. He observed that most of the alpha particles passed through with little or no deflection, meanwhile a few either deflected at large angles or bounced back.]]> 2022-02-08 02:01:11 UTC https://padlet.com/creillo0306/ezhi59k89xpnfw9d/wish/2034445234 creillo0306 https://padlet.com/creillo0306/ezhi59k89xpnfw9d/wish/2035309389 In the nuclear atom, the protons and neutrons that comprise nearly all of the mass of the atom, are located in the nucleus at the center. The electrons are located outside of the nucleus and occupy most of the volume of the atom.]]> 2022-02-08 12:15:09 UTC https://padlet.com/creillo0306/ezhi59k89xpnfw9d/wish/2035309389 creillo0306 https://padlet.com/creillo0306/ezhi59k89xpnfw9d/wish/2035328855 In 1913, the Danish scientist, Niels Bohr, proposed an improvement. ]]> 2022-02-08 12:26:20 UTC https://padlet.com/creillo0306/ezhi59k89xpnfw9d/wish/2035328855 creillo0306 https://padlet.com/creillo0306/ezhi59k89xpnfw9d/wish/2035331849 In his model, he placed each electron in a specific energy level. Electrons move in definite orbits around the nucleus much like planets circle in the sun. The orbits, or energy levels, are located at certain distances from the nucleus.]]> 2022-02-08 12:28:18 UTC https://padlet.com/creillo0306/ezhi59k89xpnfw9d/wish/2035331849 creillo0306 https://padlet.com/creillo0306/ezhi59k89xpnfw9d/wish/2035399173 In 1926, the Austrian physicist, Erwin Schrödinger, took the Bohr atom model one step further. He used mathematical equations to describe the likelihood of finding an electron in a certain position.]]> 2022-02-08 13:07:34 UTC https://padlet.com/creillo0306/ezhi59k89xpnfw9d/wish/2035399173 creillo0306 https://padlet.com/creillo0306/ezhi59k89xpnfw9d/wish/2035402615 Unlike the Bohr model, this does not define the exact path of an electron but rather predicts the odds of the location of the electron.]]> 2022-02-08 13:09:28 UTC https://padlet.com/creillo0306/ezhi59k89xpnfw9d/wish/2035402615 creillo0306 https://padlet.com/creillo0306/ezhi59k89xpnfw9d/wish/2035405557 In 1932, an unknown radiation was produced. James Chadwick interpreted this radiation as being composed of particles with a neutral electrical charge and the approximate mass of a proton.]]> 2022-02-08 13:11:00 UTC https://padlet.com/creillo0306/ezhi59k89xpnfw9d/wish/2035405557