chapter 7 - periodicity

Question 1

periodicity

Answer 1

the trend in properties that repeat across a period

Question 2

first ionisation energy

Answer 2

the amount of energy required to remove an electron from each atom in one mole of gaseous atoms to form one mole of 1+ ions

Question 3

ionisation energy across a period

Answer 3

ionisation energy increases across a period
this is because the nuclear charge increases and electron shielding does not
the greater nuclear attraction between the outer electron and the nucleus leads to a smaller atomic radius
therefore more energy is required to remove the electron

Question 4

ionisation energy down a group

Answer 4

nuclear charge increases
new shell = shielding increases
nuclear attraction on outer electron decreases
atomic radius increases
first ionisation energy decreases as less energy is required to remove the outer electrons

Question 5

factors affecting ionisation energy

Answer 5

atomic radius
nuclear charge
electron shielding