GK
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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an atom of potassium has atomic mass of 39 amu’s and an atomic number of 19. therefore it has how many neutrons
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19
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20
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21
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18
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Explanation:
Detailed explanation-1: -Detailed Solution. The Correct Answer is Option 3 i.e 20. The number of neutrons within the nucleus of a given atom can be found by subtracting the atomic number from the atomic mass i.e difference between the mass number of the atom and the atomic number. Number of neutrons = 39-19 = 20.
Detailed explanation-2: -Potassium-39-It has 19 protons and atomic mass is 39. Hence, number of neutrons is 39-19 which is 20.
Detailed explanation-3: -Potassium-39 has twenty neutrons.
Detailed explanation-4: -The element potassium’s atomic number is 19. Its relative atomic mass is 39.098.
Detailed explanation-5: -Hence, no. of neutrons = mass number-number of protons =39−19=20.
There is 1 question to complete.