THE HISTORY OF THE ATOM by Aiora Larrañaga Jimenez

THE HISTORY OF THE ATOM by Aiora Larrañaga Jimenez https://padlet.com/aioralarranaga/vjyl5ezav2wtqjfm Everything is made of ATOMS. They are really small (tiny) particles. They are so small that we cannot see them with our eyes. ATOMS are made up of three particles: protons, neutrons and electrons. en-us 2023-02-08 11:18:07 UTC 2023-02-15 11:17:54 UTC hello@padlet.com https://padlet.net/icons/png/269b.png DEMOCRITUS (440 BC) aioralarranaga https://padlet.com/aioralarranaga/vjyl5ezav2wtqjfm/wish/2474760237

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”.

]]> 2023-02-09 09:58:06 UTC https://padlet.com/aioralarranaga/vjyl5ezav2wtqjfm/wish/2474760237 JOHN DALTON (1803) aioralarranaga https://padlet.com/aioralarranaga/vjyl5ezav2wtqjfm/wish/2481123439 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).]]> 2023-02-14 08:30:37 UTC https://padlet.com/aioralarranaga/vjyl5ezav2wtqjfm/wish/2481123439 JJ THOMSON (1897) aioralarranaga https://padlet.com/aioralarranaga/vjyl5ezav2wtqjfm/wish/2481125295 He discovered negatively charged particles inside the atom (electrons).

]]> 2023-02-14 08:32:31 UTC https://padlet.com/aioralarranaga/vjyl5ezav2wtqjfm/wish/2481125295 ERNEST RUTHERFORD (1909-1911) aioralarranaga https://padlet.com/aioralarranaga/vjyl5ezav2wtqjfm/wish/2481129132 He proposed that in the center of the atom is positively charged part called the nucleus. He discovered the protons and nucleus.

]]> 2023-02-14 08:36:20 UTC https://padlet.com/aioralarranaga/vjyl5ezav2wtqjfm/wish/2481129132 NIELS BOHR (1913) aioralarranaga https://padlet.com/aioralarranaga/vjyl5ezav2wtqjfm/wish/2481131776 He improved on Rutherford's model. He proposed that electrons move around the nucleus in certain paths called energy levels. ]]> 2023-02-14 08:39:21 UTC https://padlet.com/aioralarranaga/vjyl5ezav2wtqjfm/wish/2481131776 SCHRODINGER AND HEISENBERG (1926) aioralarranaga https://padlet.com/aioralarranaga/vjyl5ezav2wtqjfm/wish/2481133108 He proposed that electrons do not travel in definite paths around the nucleus.

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