2726892
Description
Flashcards by darcy_skye, updated more than 1 year ago
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Created by darcy_skye
over 9 years ago
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| Question | Answer |
| Protons, Neutrons & Electrons | |
| Isotopes | - Same number protons / electrons, different neutrons - Top number = protons + neutrons - Bottom number = protons = electrons |
| Atomic Models (1) | J J Thompson 'plum pudding model' 1897 |
| Atomic Models (2) | Rutherford (& Geiger / Marsden) 1909 - Fired + alpha particles at thin sheet of gold - PP expected most to be deflected slightly - Instead most passed through and few deflected back -Nuclear model to show nucleus and 'cloud' of e-, most is empty space |
| Atomic Models (3) | Bohr Model - Same as Rutherford except added that; - e- in fixed orbit shells - each shell fixed energy - e- move between shells and make electromagnetic radiation is emitted or absorbed - radiation will have a fixed frequency -- noble gases are inert (can't move) i.e. with a full shell of e- it is stable and can't react |
| Relative Atomic Mass | Ar = mass of an atom of an element -------------------------------------------- 1/12th mass of atom of C 12 (1) |
| Relative Molecular Mass | Mr = mass of a molecule of an element ------------------------------------------------ 1/12th mass atom of C 12 (1) |
| Mass Spectrometer (VIADD) | Vaporisation - Sample is turned into a gas Ionisation - Hit with fast moving e- to knock an e- from sample, make it +1 ion Acceleration - +1 ion directed towards a negative magnetic field Deflection - light fast moving e- deflected, heavy slow e- aren't deflected Detection - Ions reach detector, each producing a current depending on the abundance |
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