I want to make a skript but dont know how to write it

[EmptyRooms_]

I want to make a skript where if you drop tnt as an item an explosion happens up to 20 block or everything in a 20 block range is filled with air the form of a sphere also killing players in a 10 block range and if you could make this skript please tell me the skript

Edited February 18, 2022 by EmptyRooms_
Sorry misspelled something

[nicoalla]

i have a simple skript:

 

on drop of TNT:
    create an explosion of strength 20 at the player