Briefly answer the following question:
 
What are ionic and molecular compounds? Give examples.
 
Atoms of different join together in definite proportions to form molecules of compounds.
 
Examples: Water, ammonia, carbon dioxide etc.
 
Compounds composed of metals and non-metals contain charged species. The charged species are known as . The charged particle can be negatively or positively charged. A negatively charged particle is called an , and the positively charged particle is called .
 
Examples: Sodium chloride, calcium oxide etc.