Ionisation energy

Question 1

ionisation energy

Answer 1

the amount of energy required to remove an electron from each of a mole of a gaseous atom -> produces gaseous ions with a 1+ charge

Question 2

factors that affect ionisation energy

Answer 2

core charge

Question 3

trends in ionisation energy

Answer 3

as you move down a group the first ionisation energy decreases
why? the number of occupied energy levels remains constant, and the atomic radius decreases so the outermost electrons are closer to the nucleus despite nuclear charge increasing, electron shielding also increases so core charge is constant -> less energy required to remove electron
- as you move across a period the first ionisation energy increases
why? number of occupied energy levels remain constant, atomic radius decreases so outer most electrons are closer to nucleus. core charge increases -> outermost electrons attracted to nuc. -> move energy to remove electron