level: Level 1 of Periodicity
Questions and Answers List
level questions: Level 1 of Periodicity
| Question | Answer |
|---|---|
| elements are arranged by the | increasing atom number |
| Ionisation energy is | energy required to remove 1 mole electron from one gaseous atoms to produce one mole of gaseous of 1+ ion |
| Factors affecting ionisation energy | atomic radius - decreases across a period nuclear charge -increases across a period electron shielding - stays same across a period and changes down a group |
| Atomic radius ... | the greater the distance between the nucleus and the outer electrons, the less nuclear attraction so less force of attraction |
| Nuclear charge.... | the more protons they are , the greater the attraction between the nucleus and outer electrons |
| Electron shielding | the negatively charged inner electrons repel the outer electrons so repulsion reduces the attraction between the nucleus and outer electrons |
| Succesive ionisation energies | - stripping -proton:electron ratio increases |