SSC
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The
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19
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39
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58
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20
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Explanation:
Detailed explanation-1: -Hence, no. of neutrons = mass number-number of protons =39−19=20.
Detailed explanation-2: -An element contains 20 neutrons in the nucleus and 19 electrons around it. it contains 19 protons and its atomic number is 19 and its mass number is 39.
Detailed explanation-3: -Therefore, the number of neutrons in an atom having mass number 39 and atomic number 19 is 20.
Detailed explanation-4: -A neutral atom of fluorine has a mass number of 19 and an atomic number of 9.
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