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Question

An atom which has a mass number of 14 and 8 neutrons is an isotope of ________. 


A
oxygen
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B
carbon 
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C
hydrogen
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D
nitrogen
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Solution

The correct option is D carbon 
Given, mass number = 14 and number of neutrons = 8.
Atomic number = Number of protons 
Number of protons= Mass number - Number of neutrons
So, number of protons = 14 - 8 = 6. Thus, atomic number of the element is 6.
Carbon has the atomic number 6.
Since, isotopes are the atom of same element having same atomic number but different mass number, so it is an isotope of carbon. Carbon-12, carbon-13 and carbon-14 are the isotopes of carbon.
 

Chemistry

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