History of Atoms by Aritz Valverde Urtzelai https://padlet.com/aritzvalverde/do29ritn5bkim5ap Every object is made of atoms en-us 2023-02-10 10:51:27 UTC 2025-10-07 19:05:14 UTC hello@padlet.com https://padlet.net/icons/png/1f52c.png DEMOCRITUS (440 BC) aritzvalverde https://padlet.com/aritzvalverde/do29ritn5bkim5ap/wish/2476263215 He proposed that matter could not be divided into smaller pieces forever. He said that matter was made of small, hard particles that he called “atoms”. He had an idea of an atom, meaning a piece of matter that was not able to be divided. ]]> 2023-02-10 10:57:55 UTC https://padlet.com/aritzvalverde/do29ritn5bkim5ap/wish/2476263215 JOHN DALTON (1803) aritzvalverde https://padlet.com/aritzvalverde/do29ritn5bkim5ap/wish/2476266849
He created the very first atomic theory. 
All substances are made of atoms. Atoms are small particles that cannot be created, divided, or destroyed. Atoms are invisible.
Atoms join together to make new substances (molecules).


]]> 2023-02-10 11:02:12 UTC https://padlet.com/aritzvalverde/do29ritn5bkim5ap/wish/2476266849 JJ THOMSON (1897) aritzvalverde https://padlet.com/aritzvalverde/do29ritn5bkim5ap/wish/2476269704

He discovered negatively charged particles inside the atom (electrons). 


]]> 2023-02-10 11:05:28 UTC https://padlet.com/aritzvalverde/do29ritn5bkim5ap/wish/2476269704 ERNEST RUTHERFORD (1909-1911) aritzvalverde https://padlet.com/aritzvalverde/do29ritn5bkim5ap/wish/2476270276

He proposed that in the center of the atom is positively charged part called the nucleus. He discovered the protons and nucleus. 


]]> 2023-02-10 11:06:12 UTC https://padlet.com/aritzvalverde/do29ritn5bkim5ap/wish/2476270276 NIELS BOHR (1913) aritzvalverde https://padlet.com/aritzvalverde/do29ritn5bkim5ap/wish/2476271027

He improved on Rutherford's model. He proposed that electrons move around the nucleus in certain paths called energy levels. 


]]> 2023-02-10 11:07:05 UTC https://padlet.com/aritzvalverde/do29ritn5bkim5ap/wish/2476271027 SCHRODINGER AND HEISENBERG (1926) aritzvalverde https://padlet.com/aritzvalverde/do29ritn5bkim5ap/wish/2476271861

He proposed that electrons do not travel in definite paths around the nucleus.
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