More Atomic History Neon Neon Anode Cathode Anode
- Slides: 27
More Atomic History!
Neon
Neon
Anode (+) Cathode (–)
Anode (+) Cathode (–) Cathode ray
J. J. Thomson (1897) J. J. Thomson was experimenting with cathode ray tubes. He decided to bring charged electric plates near a cathode ray.
Anode (+) Cathode (–)
Anode (+) Cathode (–) + –
Thomson discovered that the cathode ray appeared to be deflected in the direction of the positively charged plate. Because he knew that opposite charges attract, he concluded that the cathode rays must be negatively charged.
Thomson calculated that whatever this negatively charged stuff was, it was much smaller than the smallest atom. Also, this experiment worked when he tried different metals for the cathode and anode.
Dalton Timbit Models
Thomson calculated that whatever this negatively charged stuff was, it was much smaller than the smallest atom. Also, this experiment worked when he tried different metals for the cathode and anode.
Thomson’s Conclusion Atoms contain negatively charged particles. These are called electrons.
I discovered the electron, a negative particle, that makes up part of the atom. Atoms are positively (+) charged balls with electrons (-) imbedded (like a chocolate chip muffin). The net result is a neutral atom. By the way, atoms are divisible! !
Thomson’s model was nicknamed the “plum pudding model”.
Fun fact: Old TVs and computer screens (not flat screens) work by cathode ray tubes.
Ernest Rutherford Radioactive substances can give off alpha (+), beta (-) and gamma (neutral) radiation. I bombarded gold foil with alpha (+) particles. Ernest Rutherford, 1911 !
Ernest Rutherford Radioactive substances can give off alpha (+), beta (-) and gamma (neutral) radiation. I bombarded gold foil with alpha (+) particles. Ernest Rutherford, 1911 !
Gold Foil Experiment
2 conclusions Atoms An are mostly empty space. atom contains a very dense and small nucleus. The nucleus is positively charged.
2 conclusions Atoms An are mostly empty space. atom contains a very dense and small nucleus. The nucleus is positively charged.
If this soccer ball were the nucleus of an atom, how far away would the nearest electron be?
What can we conclude from this? Atoms are mostly empty space.
- More more more i want more more more more we praise you
- More more more i want more more more more we praise you
- Galvanic vs electrolytic cell
- Electrons flow from cathode to anode
- Half reduction reaction
- Cell reaction
- Cell representation
- Chapter 20 electrochemistry
- Anode cathode diode
- Anode and cathode equation
- Cathode anode standard reduction potential
- Cathode oxidation or reduction
- Common anode and common cathode
- What is the reaction at the anode in a breathalyzer?
- The ni-cd cell delivers a potential difference of
- Panic positive anode
- Cathode vs anode equation
- Zone electrophoresis definition
- How to remember anode and cathode
- Element neon facts
- Atomic size of neon
- Atom model of neon
- Human history becomes more and more a race
- Is atomic mass and relative atomic mass the same
- Patterns in the periodic table
- Atomic radius increases when
- Isotope abundance formula
- Difference between atomic mass and atomic number