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Description
Flashcards by ioannis_lion, updated more than 1 year ago
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Created by ioannis_lion
over 11 years ago
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| Question | Answer |
| Mass numbers are not whole numbers as... | They are a more accurate way of showing a variety of mass numbers |
| Isotope | The different form of an element with different numbers of neutrons |
| Carbon-12 and carbon-13 occur | 98.9% and 1.1% |
| Carbon-14 breaks down through radioactive decay to form | Nitrogen an electron and electromagnetic radiation |
| Relative atomic mass | The average mass of isotopes of an element according to their rarity |
| Periodic table shows relative atomic mass to... | 2 decimal places |
| Neil's Bohr | Concluded that electrons orbit the nucleus in certain distances |
| Electron shells | Are orbits in which electrons are located around a nucleus according to their energy |
| Bohr Model | A model proposed by Neil's Bohr in which electrons orbit in energy levels |
| Electron configuration | Arrangement of electrons around around an atom |
| In the first 20 elements.. | They 3rd she'll can accommodate 8 whilst higher ones accommodate 18 |
| Maximum number of electrons a shell can hold is | 2nsquared n=number of shells from nucleus |
| The closer the electrons are... | The more stable |
| She'll diagrams | Show electron configuration by shells in circles and electrons in pairs |
| Valence Shell | The outermost unoccupied shell |
| Emission Spectrum | Pattern of colours seen an element is placed under a spectroscope |
| Why does emission spectrum occur. | When element is placed under flame electrons jump up a shell and every jump releases light in different wavelengths. |
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