Flashcards
The Atomic Structure and History
Cards in this deck (12)
- 1Define Daltons Atomic Theory1. All matter is made up of minute particles called atoms. They are indivisible.
- 2What is William Crookes credited for?Conducting experiments using vaccum tubes (i.e) Maltese Cross and Paddle wheel tube experiments
- 3What is J.J Thomson credited forDiscovered the Electron and was able to calculate its charge to mass ratio (e/m) by cancelling out the attractive forces using a magnetic field
- 4Describe J.J Thomsons Plum Pudding modelPositively charged matter imbedded with electrons
- 5What is Robert Millikan credited for?Carried out the Oil drop experiments where he discovered the charge of the electron (e) and thus the mass (m) of the electron
- 6Describe the Oil drop experimentOil was sprayed in a fine mist. X-Rays were used to knock electrons out of the air which was picked up by the oil becoming negatively charged. Charge on plates were adjusted until the oil was suspended mid air.
- 7What is Ernest Rutherford credited forDiscovering the Nucleus by bombarding thin gold foil with Alpha particles
- 8What was his first Observation and conclusion?Most Alpha particles passed straight through undeflected indicating that matter is mostly empty space
- 9What was his second Observation and conclusion?Some Alpha particles deflected at large angles indicating that +ve Alpha particles are repelled when passing a positive nucleus
- 10What was his last Observation and conclusion?A very small no. of Alpha particles were reflected back along their original path indicating that +ve Alpha particles collided head on with the nucleus
- 11What is James Chadwick credited for?Discovered the Neutron by bombarding Beryllium nuclei with Alpha particles. The Alpha particles broke nuclei in the beryllium causing neutrons to be expelled from the nucleus.
- 12Properties of Subatomic Particles
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- Leaving Certificate Chemistry Flashcards on The Atomic Structure and History, created by Omer Zuhair on 31/12/2022.
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- Omer Zuhair
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