He discovered this by firing Alpha particles at a gold foil and most alpha particles went through the foil and a few were deflected. The area where the alpha particles were deflected were assumed where the small dense positively charged nucleus was located. And electrons were scattered in the empty space out side the small nucleus.
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A compound
its refers to a substance formed when two or more types of atoms bond chemically
Organic chemical compounds as recommended by the (IUPAC)
