Final answer:
The heaviest member of each group are: alkali metals - Francium (Fr), alkaline earth metals - Radium (Ra), halogens - Astatine (At), noble gases - Radon (Rn).
Step-by-step explanation:
The heaviest member of each group are as follows:
a) Alkali metals: Francium (Fr) is the heaviest alkali metal with an atomic weight of 223.
b) Alkaline earth metals: Radium (Ra) is the heaviest alkaline earth metal with an atomic weight of 226.
c) Halogens: Astatine (At) is the heaviest halogen with an atomic weight of 210.
d) Noble gases: Radon (Rn) is the heaviest noble gas with an atomic weight of 222.