THE HISTORY OF THE ATOM by Unai Gabilondo Jimenez https://padlet.com/unaigabilondo/8e5w12aalv1az49y Everything is made of ATOMS en-us 2023-02-14 11:07:27 UTC 2023-02-15 09:37:36 UTC hello@padlet.com https://padlet.net/icons/png/1f50e.png DEMOCRITUS (440 BC) unaigabilondo https://padlet.com/unaigabilondo/8e5w12aalv1az49y/wish/2483189469

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”. 


]]> 2023-02-15 09:10:41 UTC https://padlet.com/unaigabilondo/8e5w12aalv1az49y/wish/2483189469 JOHN DALTON (1803) unaigabilondo https://padlet.com/unaigabilondo/8e5w12aalv1az49y/wish/2483191137 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).]]> 2023-02-15 09:12:24 UTC https://padlet.com/unaigabilondo/8e5w12aalv1az49y/wish/2483191137 ERNEST RUTHERFORD (1909-1911) unaigabilondo https://padlet.com/unaigabilondo/8e5w12aalv1az49y/wish/2483202512 He proposed that in the center of the atom is positively charged part called the nucleus. He discovered the protons and nucleus. 


]]> 2023-02-15 09:23:22 UTC https://padlet.com/unaigabilondo/8e5w12aalv1az49y/wish/2483202512 NIELS BOHR (1913) unaigabilondo https://padlet.com/unaigabilondo/8e5w12aalv1az49y/wish/2483206397

He improved on Rutherford's model. He proposed that electrons move around the nucleus in certain paths called energy levels. 
]]> 2023-02-15 09:27:14 UTC https://padlet.com/unaigabilondo/8e5w12aalv1az49y/wish/2483206397 SCHRODINGER AND HEISENBERG (1926) unaigabilondo https://padlet.com/unaigabilondo/8e5w12aalv1az49y/wish/2483209545 SCHRODINGER AND HEISENBERG (1926)

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


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