Atom Timeline by Erik Nadecki https://padlet.com/ernadecki/jh6jevg8p95owqkh Famous people in the Atomic community en-us 2021-11-22 13:04:55 UTC 2025-02-20 04:22:22 UTC hello@padlet.com https://padlet.net/icons/png/1f52c.png Democritis 460 BC ernadecki https://padlet.com/ernadecki/jh6jevg8p95owqkh/wish/1906053718 -He proposed that all matter, including space and time, was made up of small units named atoms. He did not experiment and had little evidence to support this, but his idea was kept on by Lucretius.

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]]> 2021-11-22 13:20:17 UTC https://padlet.com/ernadecki/jh6jevg8p95owqkh/wish/1906053718 John Dalton 1803 AD ernadecki https://padlet.com/ernadecki/jh6jevg8p95owqkh/wish/1906057013 Agreed that all matter was created by atoms which he believed were indestructible. He also stated that compounds are created by combining two atoms and that all atoms of given elements are identical in their mass and properties. ]]> 2021-11-22 13:21:46 UTC https://padlet.com/ernadecki/jh6jevg8p95owqkh/wish/1906057013 JJ Thomson 1897 AD ernadecki https://padlet.com/ernadecki/jh6jevg8p95owqkh/wish/1906060566 Discovered the electron. He experimented by testing and studying the nature of electric discharge in a high vacuum cathode-ray tube.]]> 2021-11-22 13:23:16 UTC https://padlet.com/ernadecki/jh6jevg8p95owqkh/wish/1906060566 Neils Bohr 1913 AD ernadecki https://padlet.com/ernadecki/jh6jevg8p95owqkh/wish/1906065718 Explained that outer orbits in an atom could hold more electrons than the inner orbits By knowing this one can determine the atom's chemical properties. He also started the idea that electrons emit light by jumping orbits. ]]> 2021-11-22 13:25:09 UTC https://padlet.com/ernadecki/jh6jevg8p95owqkh/wish/1906065718 Ernest Rutherford 1907 AD ernadecki https://padlet.com/ernadecki/jh6jevg8p95owqkh/wish/1906070718 Used the gold foil experiment to discover the modem model of an atom. He concluded that all positive charges were centralized, white negative electrons orbited the nucleus.]]> 2021-11-22 13:27:08 UTC https://padlet.com/ernadecki/jh6jevg8p95owqkh/wish/1906070718 Henry Moseley 1910 AD ernadecki https://padlet.com/ernadecki/jh6jevg8p95owqkh/wish/1906075749 A British physicist who demonstrated through experiments that the major properties of an element are determined by the atomic number, not by the atomic weight, and firmly established the relationship between atomic number and the charge of the atomic nucleus, it is positive.]]> 2021-11-22 13:29:10 UTC https://padlet.com/ernadecki/jh6jevg8p95owqkh/wish/1906075749 Louis de Broglie 1924 AD ernadecki https://padlet.com/ernadecki/jh6jevg8p95owqkh/wish/1906086708 he suggested that particles most likely have wave properties in addition to particle properties. a few years later the wave nature of electrons was detected through experiments. Objects of everyday experience, however, have a computed wavelength much smaller than that of electrons, so their wave properties have never been detected; familiar objects show only particle behavior.]]> 2021-11-22 13:33:16 UTC https://padlet.com/ernadecki/jh6jevg8p95owqkh/wish/1906086708 Erwin Schrodinger 1933 AD ernadecki https://padlet.com/ernadecki/jh6jevg8p95owqkh/wish/1906093274  proposed that the quantum mechanical model of the atom, which treats electrons as matter waves. Electrons have an constant property called spin, and an electron can have one of two possible spin values: spin-up or spin-down. Any two electrons occupying the same orbital must have opposite spins.]]> 2021-11-22 13:35:34 UTC https://padlet.com/ernadecki/jh6jevg8p95owqkh/wish/1906093274