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Q.

A potassium atom has 19 protons. The mass number of potassium is 39. How many neutrons are present in an atom of potassium?

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a

39

b

20

c

49

d

19

answer is B.

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Detailed Solution

detailed_solution_thumbnail

Number of neutrons in potassium = 20

Solution:

Mass number = Number of protons + Number of protons

Number of neutrons = Mass number − Number of protons

                                         = 39 − 19 

                                        = 20

Number of neutrons in potassium = 20

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