SSC
CHEMISTRY
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 Question 
 [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
 
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  an atom 
 
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  a bond 
 
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  an element 
 
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  a molecule 
 
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Detailed explanation-1: -Like everything we see in the world, isotopes are a type of atom, the smallest unit of matter that retains all the chemical properties of an element. Isotopes are forms of a chemical element with specific properties. You can see the different chemical elements on the periodic table.
Detailed explanation-2: -The smallest particle of a substance that has all of the physical and chemical properties of that substance. Molecules are made up of one or more atoms.
Detailed explanation-3: -An atom is the smallest unit of matter that retains all of the chemical properties of an element. For example, a gold coin is simply a very large number of gold atoms molded into the shape of a coin, with small amounts of other, contaminating elements.