![The Divisibility of Matter ,[object Object],[object Object],[object Object],[object Object],“ Nothing exists except atoms and empty space; everything else is opinion.” - Democritus 460–370 B.C.](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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The atomic history
- 1. Chapter 4 Atoms and Elements
- 3. Atomic Theory of Matter The belief that atoms are the fundamental building blocks of matter was reemerged in the early 19th century, championed by John Dalton.
- 5. Modern structure of the atom Subatomic Particle Symbol Electron e- Proton p Neutron n
- 8. Rutherford’s model of the atom http://highered.mcgraw-hill.com/sites/0072512644/student_view0/chapter2/animations_center.html -
- 9. In 1932 Chadwick observed that beryllium, when bombarded by alpha particles, released an unknown radiation that was neutral. Chadwick interpreted this radiation as being composed of particles of mass approximately equal to that of the proton, but without electrical charge--neutrons. The Neutron
Notas del editor
- In this chapter we will be discussing the building blocks of substances: atoms
- The notion of atomism started in the fifth century B.C.
- The notion “atomism” wasn’t accepted really well in the fifth century until the 1800s when John Dalton presented a complete definition of the atom.
- John Dalton presented atoms as the smallest building blocks of matter.
- Experimentation showed that atoms are actually composed of smaller particles called subatomic particles. These include electrons, protons, and neutrons.
- J. J Thompson discovered the electrons using cathode ray tubes.
- Thomson explained the structure of the atoms in the “plum Pudding” model
- Rutherford proved that the “plum pudding “model was wrong and he discovered the nucleus in the atom.
- Chadwick discovered the entities that are responsible for the stability of the atom.
- This the modern structureof the atom