Chapter 7

Question 1

group

Answer 1

elements in the same group have the same number of electron in their outer shell and similar chemical properties

Question 2

periods

Answer 2

elements in the same period have their highest energy electrons in the same electron shell

Question 3

periodicity

Answer 3

is a repeating trend in properties across each period

Question 4

factors affecting ionisation energy

Answer 4

atomic radius, nuclear charge and electron shielding

Question 5

first ionisation energy

Answer 5

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