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Trends
Question | Answer |
---|---|
Atomic Radii down a column ___________ | Increases |
Give two reasons for change in atomic radii down columns | New energy shell & Screening effect of inner electrons |
Define atomic radius | Half the distance between the nuclei two covalently bonded atoms of the same element |
Atomic radii across a period ___________ | Decreases |
Give two reasons for change in atomic radii across a period | Increase in effective nuclear charge & No increase in screening effect |
Define first ionisation energy | Energy required to remove losest electron from its bond with an atom in its ground state |
Values for first ionisation energy __________ down a column | Decrease |
Give two reasons for the change in first ionisation energy down a column | Increasing atomic radii & Screening effect of inner electrons |
Values for first ionisation energy __________ across a period | Increase |
Give two reasons for the change in first ionisation energy across a period | Increasing effective nuclear charge & Decrease in atomic radii |
Define electronegativity | Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons |
Values for electronegativity __________ across a period | Increase |
Give two reasons for the change in electronegativity values across a period | Increasing effective nuclear charge & Decrease in atomic radii |
Values for electronegativity __________ down a column | Decrease |
Give two reasons for the change in electronegativity values down a column | Increasing atomic radii & Screening effect of inner electrons |