https://padlet.com/monachino_f/s5zr9bx19igu Evolution of the atom en-us 2017-10-11 15:40:14 UTC 2025-10-23 11:14:53 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Bigthunderstorm.png monachino_f https://padlet.com/monachino_f/s5zr9bx19igu/wish/196044396 He defined atoms, did the building block theory: atoms are the smallest lego pieces put together they make up everything. Believe that atoms were indivisible and indestructible. ]]> 2017-10-11 14:27:34 UTC https://padlet.com/monachino_f/s5zr9bx19igu/wish/196044396 monachino_f https://padlet.com/monachino_f/s5zr9bx19igu/wish/196048127 Believed that the model of the atom resembled a small, solid ball]]> 2017-10-11 14:34:56 UTC https://padlet.com/monachino_f/s5zr9bx19igu/wish/196048127 monachino_f https://padlet.com/monachino_f/s5zr9bx19igu/wish/196051209 discovered the change of an electron that has a positive charge "plum pudding" electrons were stuck into a lump of positive charge. ]]> 2017-10-11 14:40:53 UTC https://padlet.com/monachino_f/s5zr9bx19igu/wish/196051209 monachino_f https://padlet.com/monachino_f/s5zr9bx19igu/wish/196055253 The atom is mostly positive charge spaced with a central nucleus by doing an experiment from shooting alpha particles at a gold foil and observed that most of the particles passed through and only a few were reflected  ]]> 2017-10-11 14:48:31 UTC https://padlet.com/monachino_f/s5zr9bx19igu/wish/196055253 monachino_f https://padlet.com/monachino_f/s5zr9bx19igu/wish/196057895 By using experimental methods, Dalton transformed Democritus's ideas on atoms into a scientific theory. Dalton's atomic theory 
1. All elements are composed of tiny indivisible particles called atoms 
2. Atoms of the same element are identical. The atoms of any one element are different from those of any other element.
3. Atoms of different elements can physically mix together or can chemically combine in simple whole number ratios to form a compound 
4. Chemical reactions occur when atoms are separated, joined, or rearranged. Atoms of one element, however, are never changed into atom of another element as a result of a chemical reaction ]]> 2017-10-11 14:53:36 UTC https://padlet.com/monachino_f/s5zr9bx19igu/wish/196057895 monachino_f https://padlet.com/monachino_f/s5zr9bx19igu/wish/196065104 Developed mathematical equations to describe the motion of electrons in atoms. His work led to the electron cloud model. electrons belong to a particular energy level and orbital are to be found in those orbitals 90% of the time]]> 2017-10-11 15:06:43 UTC https://padlet.com/monachino_f/s5zr9bx19igu/wish/196065104 monachino_f https://padlet.com/monachino_f/s5zr9bx19igu/wish/196077122 "canal rays" which had electrical and magnetic properties electrons have a negative effect. ]]> 2017-10-11 15:28:58 UTC https://padlet.com/monachino_f/s5zr9bx19igu/wish/196077122 monachino_f https://padlet.com/monachino_f/s5zr9bx19igu/wish/196084009 2017-10-11 15:41:34 UTC https://padlet.com/monachino_f/s5zr9bx19igu/wish/196084009 monachino_f https://padlet.com/monachino_f/s5zr9bx19igu/wish/196085555 Discovered the neutron in the nucleus ]]> 2017-10-11 15:44:07 UTC https://padlet.com/monachino_f/s5zr9bx19igu/wish/196085555