Why does the group 15 elements called Pnicogens and group 16 elements called Aerogen - Chemistry - Classification of Elements and Periodicity in Properties

Question

Why does the group 15 elements called Pnicogens and group 16
elements called Aerogen

Avni · Accepted Answer

Group 15 elements are called pnicogens because they are poisonous
and choking in nature Pninogen means "to choke"
Group 16 elements are not called 'aerogens' they are called
chalcogens 
because they are ore forming elements
The noble gases or group 18 elements are called
'aerogens'

Why does the group 15 elements called Pnicogens and group 16 elements called Aerogen.