The prefix "poly-" means "many," and "atomic" refers to atoms, so a polyatomic ion is made of 2+ atoms covalently bonded together. These ions are charged, which is why they can never stand alone.
Answer:
the three products of destructive distillation of coal are:-
1. coal gas
2. coke
3. ammonia liquor
The main idea of an essay is usually portrayed in the thesis.