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 |