chemistry 11 early models of the atom. ancient greeks were the first to come up with the idea of...
TRANSCRIPT
![Page 1: Chemistry 11 Early Models of the Atom. Ancient Greeks were the first to come up with the idea of atoms. Democritus Democritus suggested that all matter](https://reader035.vdocuments.site/reader035/viewer/2022062221/56649d8b5503460f94a72e6b/html5/thumbnails/1.jpg)
Chemistry 11Early Models of the Atom
![Page 2: Chemistry 11 Early Models of the Atom. Ancient Greeks were the first to come up with the idea of atoms. Democritus Democritus suggested that all matter](https://reader035.vdocuments.site/reader035/viewer/2022062221/56649d8b5503460f94a72e6b/html5/thumbnails/2.jpg)
Ancient Greeks were the first to come up with the idea of atoms.
Democritus
Democritus suggested that all matter was made of tiny indivisible particles called atoms. (Greek “atoma”)
![Page 3: Chemistry 11 Early Models of the Atom. Ancient Greeks were the first to come up with the idea of atoms. Democritus Democritus suggested that all matter](https://reader035.vdocuments.site/reader035/viewer/2022062221/56649d8b5503460f94a72e6b/html5/thumbnails/3.jpg)
In the dark ages, the idea of atoms was frowned upon. Not much progress was made.
ATOMS? What’s that?
OFF with your HEAD!
![Page 4: Chemistry 11 Early Models of the Atom. Ancient Greeks were the first to come up with the idea of atoms. Democritus Democritus suggested that all matter](https://reader035.vdocuments.site/reader035/viewer/2022062221/56649d8b5503460f94a72e6b/html5/thumbnails/4.jpg)
In the early 1800’s, John Dalton came up with the ATOMIC THEORY.
![Page 5: Chemistry 11 Early Models of the Atom. Ancient Greeks were the first to come up with the idea of atoms. Democritus Democritus suggested that all matter](https://reader035.vdocuments.site/reader035/viewer/2022062221/56649d8b5503460f94a72e6b/html5/thumbnails/5.jpg)
His main points were:Dalton’s Atomic Theory1) All matter is made of atoms. Atoms are indivisible and indestructible.2) All atoms of a given element are identical in mass and properties 3) Compounds are formed by a combination of two or more different kinds of atoms.4) A chemical reaction is a rearrangement of atoms.
![Page 6: Chemistry 11 Early Models of the Atom. Ancient Greeks were the first to come up with the idea of atoms. Democritus Democritus suggested that all matter](https://reader035.vdocuments.site/reader035/viewer/2022062221/56649d8b5503460f94a72e6b/html5/thumbnails/6.jpg)
Compounds are composed of little “balls” called atoms, joined together by “bonds” to form molecules.
![Page 7: Chemistry 11 Early Models of the Atom. Ancient Greeks were the first to come up with the idea of atoms. Democritus Democritus suggested that all matter](https://reader035.vdocuments.site/reader035/viewer/2022062221/56649d8b5503460f94a72e6b/html5/thumbnails/7.jpg)
An indestructible “Dalton” atom
Ha Ha! You can’t break
me!!!!
![Page 8: Chemistry 11 Early Models of the Atom. Ancient Greeks were the first to come up with the idea of atoms. Democritus Democritus suggested that all matter](https://reader035.vdocuments.site/reader035/viewer/2022062221/56649d8b5503460f94a72e6b/html5/thumbnails/8.jpg)
crookes tube
J.J. Thomson's Experiments
Using Crooke’s tubes and other equipment, J.J. Thomson discovered the electron and measured its e/m (charge to mass) ratio.
Later, “e” was found and the mass of an electron was found to be 9.10938188 × 10-28 grams (much lighter than H)
![Page 9: Chemistry 11 Early Models of the Atom. Ancient Greeks were the first to come up with the idea of atoms. Democritus Democritus suggested that all matter](https://reader035.vdocuments.site/reader035/viewer/2022062221/56649d8b5503460f94a72e6b/html5/thumbnails/9.jpg)
Thomson’s Plum Pudding Model
![Page 10: Chemistry 11 Early Models of the Atom. Ancient Greeks were the first to come up with the idea of atoms. Democritus Democritus suggested that all matter](https://reader035.vdocuments.site/reader035/viewer/2022062221/56649d8b5503460f94a72e6b/html5/thumbnails/10.jpg)
Ernest Rutherford
![Page 11: Chemistry 11 Early Models of the Atom. Ancient Greeks were the first to come up with the idea of atoms. Democritus Democritus suggested that all matter](https://reader035.vdocuments.site/reader035/viewer/2022062221/56649d8b5503460f94a72e6b/html5/thumbnails/11.jpg)
Rutherford’s Scattering Experiment
![Page 13: Chemistry 11 Early Models of the Atom. Ancient Greeks were the first to come up with the idea of atoms. Democritus Democritus suggested that all matter](https://reader035.vdocuments.site/reader035/viewer/2022062221/56649d8b5503460f94a72e6b/html5/thumbnails/13.jpg)
Rutherford could not explain why the electron didn’t fall into the nucleus and destroy the atom.
?
![Page 14: Chemistry 11 Early Models of the Atom. Ancient Greeks were the first to come up with the idea of atoms. Democritus Democritus suggested that all matter](https://reader035.vdocuments.site/reader035/viewer/2022062221/56649d8b5503460f94a72e6b/html5/thumbnails/14.jpg)
Neils Bohr
I think I can help!
![Page 15: Chemistry 11 Early Models of the Atom. Ancient Greeks were the first to come up with the idea of atoms. Democritus Democritus suggested that all matter](https://reader035.vdocuments.site/reader035/viewer/2022062221/56649d8b5503460f94a72e6b/html5/thumbnails/15.jpg)
spectra and bohr
![Page 16: Chemistry 11 Early Models of the Atom. Ancient Greeks were the first to come up with the idea of atoms. Democritus Democritus suggested that all matter](https://reader035.vdocuments.site/reader035/viewer/2022062221/56649d8b5503460f94a72e6b/html5/thumbnails/16.jpg)
Bohr pictured the hydrogen atom as having discrete energy “levels” which the electron could “inhabit”. In it’s ground state, the electron would be in the lowest level (n=1)
When the atom was “excited” the electron could “jump” to a higher level.
When the electron came back down, it released energy in the form of light.
![Page 17: Chemistry 11 Early Models of the Atom. Ancient Greeks were the first to come up with the idea of atoms. Democritus Democritus suggested that all matter](https://reader035.vdocuments.site/reader035/viewer/2022062221/56649d8b5503460f94a72e6b/html5/thumbnails/17.jpg)
Each “jump” would give off light of a particular wavelength or colour. This gave rise to hydrogen’s spectrum.
![Page 18: Chemistry 11 Early Models of the Atom. Ancient Greeks were the first to come up with the idea of atoms. Democritus Democritus suggested that all matter](https://reader035.vdocuments.site/reader035/viewer/2022062221/56649d8b5503460f94a72e6b/html5/thumbnails/18.jpg)
According to Bohr, each energy “level” corresponded to a different “orbit” of an electron around the atom. (Like planets around the sun.)
This model is really cool !!
![Page 19: Chemistry 11 Early Models of the Atom. Ancient Greeks were the first to come up with the idea of atoms. Democritus Democritus suggested that all matter](https://reader035.vdocuments.site/reader035/viewer/2022062221/56649d8b5503460f94a72e6b/html5/thumbnails/19.jpg)
![Page 20: Chemistry 11 Early Models of the Atom. Ancient Greeks were the first to come up with the idea of atoms. Democritus Democritus suggested that all matter](https://reader035.vdocuments.site/reader035/viewer/2022062221/56649d8b5503460f94a72e6b/html5/thumbnails/20.jpg)
Bohr even calculated what the radii of these orbits would be.
![Page 21: Chemistry 11 Early Models of the Atom. Ancient Greeks were the first to come up with the idea of atoms. Democritus Democritus suggested that all matter](https://reader035.vdocuments.site/reader035/viewer/2022062221/56649d8b5503460f94a72e6b/html5/thumbnails/21.jpg)
Element 107 on the Periodic Table is called Bohrium (Bh)
![Page 22: Chemistry 11 Early Models of the Atom. Ancient Greeks were the first to come up with the idea of atoms. Democritus Democritus suggested that all matter](https://reader035.vdocuments.site/reader035/viewer/2022062221/56649d8b5503460f94a72e6b/html5/thumbnails/22.jpg)
In the 1920’s things changed!
Although Bohr’s idea of energy levels was still accepted, his idea of planetary orbits for electrons was rejected!
REJECT ! !
![Page 23: Chemistry 11 Early Models of the Atom. Ancient Greeks were the first to come up with the idea of atoms. Democritus Democritus suggested that all matter](https://reader035.vdocuments.site/reader035/viewer/2022062221/56649d8b5503460f94a72e6b/html5/thumbnails/23.jpg)
So……
What’s Next???????????????
![Page 24: Chemistry 11 Early Models of the Atom. Ancient Greeks were the first to come up with the idea of atoms. Democritus Democritus suggested that all matter](https://reader035.vdocuments.site/reader035/viewer/2022062221/56649d8b5503460f94a72e6b/html5/thumbnails/24.jpg)