https://padlet.com/dones136524120497/smx75geanzi9sk48 Construct a timeline of the development of the atomic theories and models using padlet ( See padlet.com). Emphasize on the scientist, date, contribution, image of scientists and their corresponding models. ✶8-Amorsolo; Group 3: DELA CRUZ, JB. DELA CRUZ, J. DONES, A. GRADO, J. GUERRERO, A.✶ en-us 2021-04-08 12:08:33 UTC 2025-11-06 13:40:47 UTC hello@padlet.com https://padlet.net/icons/png/1f9ec.png dones136524120497 https://padlet.com/dones136524120497/smx75geanzi9sk48/wish/1395586696 Democritus' atomic theory stated that all matter is made up of small, indestructible units he called atoms atoms.

]]> 2021-04-08 12:47:41 UTC https://padlet.com/dones136524120497/smx75geanzi9sk48/wish/1395586696 delacruz136524120151 https://padlet.com/dones136524120497/smx75geanzi9sk48/wish/1395644213 The periodic table was invented by Dmitri Mendeleev.

]]> 2021-04-08 13:01:00 UTC https://padlet.com/dones136524120497/smx75geanzi9sk48/wish/1395644213 delacruz136524120151 https://padlet.com/dones136524120497/smx75geanzi9sk48/wish/1395653279 Elements, according to John Dalton, are made up of identical atoms of the same mass, and compounds are atoms from different elements combined together.

]]> 2021-04-08 13:03:03 UTC https://padlet.com/dones136524120497/smx75geanzi9sk48/wish/1395653279 dones136524120497 https://padlet.com/dones136524120497/smx75geanzi9sk48/wish/1395653536 Thomson calculated the charge-to-mass ratio of electrons.

]]> 2021-04-08 13:03:06 UTC https://padlet.com/dones136524120497/smx75geanzi9sk48/wish/1395653536 dones136524120497 https://padlet.com/dones136524120497/smx75geanzi9sk48/wish/1395656337 In radiation, Rutherford discovered alpha, beta, and gamma rays.

]]> 2021-04-08 13:03:45 UTC https://padlet.com/dones136524120497/smx75geanzi9sk48/wish/1395656337 dones136524120497 https://padlet.com/dones136524120497/smx75geanzi9sk48/wish/1395657463 The word "isotope" was created by Frederick Soddy to describe the unintentional breakdown of radioactive elements.

]]> 2021-04-08 13:04:00 UTC https://padlet.com/dones136524120497/smx75geanzi9sk48/wish/1395657463 dones136524120497 https://padlet.com/dones136524120497/smx75geanzi9sk48/wish/1395658678 Hans Geiger invented a device that could detect alpha particles.]]> 2021-04-08 13:04:16 UTC https://padlet.com/dones136524120497/smx75geanzi9sk48/wish/1395658678 dones136524120497 https://padlet.com/dones136524120497/smx75geanzi9sk48/wish/1395660714 According to Niels Bohr's atomic structure theory, an atom's outer orbit could hold more electrons than its inner orbit.]]> 2021-04-08 13:04:41 UTC https://padlet.com/dones136524120497/smx75geanzi9sk48/wish/1395660714 dones136524120497 https://padlet.com/dones136524120497/smx75geanzi9sk48/wish/1395662845 James Chadwick discovered neutrons, particles with a mass close to that of a proton.]]> 2021-04-08 13:05:00 UTC https://padlet.com/dones136524120497/smx75geanzi9sk48/wish/1395662845 dones136524120497 https://padlet.com/dones136524120497/smx75geanzi9sk48/wish/1395665284 Glenn Seaborg was the discoverer of eight transuranium elements.]]> 2021-04-08 13:05:29 UTC https://padlet.com/dones136524120497/smx75geanzi9sk48/wish/1395665284 dones136524120497 https://padlet.com/dones136524120497/smx75geanzi9sk48/wish/1395666202 Enrico Fermi was the first to build a man-made nuclear reactor.]]> 2021-04-08 13:05:38 UTC https://padlet.com/dones136524120497/smx75geanzi9sk48/wish/1395666202 delacruz136529130016 https://padlet.com/dones136524120497/smx75geanzi9sk48/wish/1396003369 The three of them discovered nuclear fission.]]> 2021-04-08 14:12:29 UTC https://padlet.com/dones136524120497/smx75geanzi9sk48/wish/1396003369 grado136619120077 https://padlet.com/dones136524120497/smx75geanzi9sk48/wish/1396204273 After studying the decay of uranium and thorium, Marie Sklodowska Curie discovered radium and polonium and coined the term radioactivity.

]]> 2021-04-08 14:50:58 UTC https://padlet.com/dones136524120497/smx75geanzi9sk48/wish/1396204273