5262819
Description
Flashcards by Bee Brittain, updated more than 1 year ago
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Created by Bee Brittain
about 8 years ago
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| Question | Answer |
| The positions of elements in the periodic table are linked to what? | The positions of elements in the periodic table are linked to their physical and chemical properties. |
| Groups | A group is a vertical column. Each element in a group has atoms with the same number of outer-shell electrons and similar properties. |
| Atomic Number | Reading from left to right, the elements are arranged in order of increasing atomic number. Each successive element has atoms with one extra proton. |
| Trend across a Period - Period 2 | Across period 2, the 2s sub-shells fill with two electrons, followed by the 2p sub-shell which fills with 6 electrons |
| Trend across a Period - Period 3 | Across period 3, the 3s sub-shells fill with two electrons, followed by the 3p sub-shell which fills with 6 electrons |
| Trend across a Period - Period 4 | Although the 3d sub-shell is involved, the highest number shell is n=4. From the n=4 shell, only 4s and 4p shells are occupied. |
| Trend down a Group | - Elements in the same group have the same number of electrons in their outer shell - Elements in each groups also have atoms with the same number of electrons in each sub-shell - This gives elements in the same group their similar characteristics/chemistry. |
| Periods | Elements are arranged in horizontal rows called periods, the number of the period gives the number of the highest energy electron shell in an elements atoms. |
| Periodicity | Across each period there is a repeating trend in properties of the elements called periodicity. |
| What are the most obvious periodicity properties is the trend from metals to non-metals | - Electron Configuration - Structure - Melting Points - Ionisation Energy |
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